How to Clean and Care for Polywood Furniture

Polywood furniture is easy to own. But it still needs some care.

This guide covers everything you need to clean it, protect it, and keep it looking new for years.

Polywood (also called poly lumber) is furniture made from recycled HDPE plastic. It's built to handle sun, rain, and daily use without rotting or cracking. Many manufacturers make this lumber from 95% recycled plastic, which is also fully recyclable at the end of its life.

That durability is why so many people choose it over wood. But "low-maintenance" does not mean "no maintenance." Dirt, pollen, and moisture can still build up on the surface over time.

In this guide, you'll learn:

• What polywood is made of, and why that affects how you clean it

• Step-by-step cleaning instructions

• How to remove mold, mildew, and tough stains

• Safe pressure washing tips

• How to care for cushions and fabric

• Mistakes to avoid

• How to prepare your furniture for winter

• How long polywood lasts with proper care

If you're shopping for new pieces rather than caring for ones you already own, you can browse Gooddegg's full PolyLumber collection to see the styles and finishes available.

Let's start with the material itself, since that determines every cleaning choice you'll make.

What Is Polywood Furniture Made Of?

Polywood furniture is made from HDPE (high-density polyethylene), a recycled plastic sourced from items like milk jugs and detergent bottles. Manufacturers blend in UV inhibitors and color pigment before shaping it into lumber, which is why it resists fading, cracking, and moisture damage.

Poly lumber is not painted or coated. The color runs all the way through the material, called color-through construction. This is why scratches don't show a different color underneath, unlike painted wood furniture.

The plastic itself starts as recycled HDPE. It gets shredded, melted into pellets, and mixed with dye and UV protectant. Then it's shaped into solid boards and built into furniture (source: DutchCrafters).

Because the color and UV protection are built into the plastic itself, not sprayed on top, most surface cleaners won't strip the finish the way they might on painted wood. But that doesn't mean every cleaner is safe - some can still dull the surface over time, which we'll cover shortly.

If you'd like to see the full manufacturing process, this short video shows how post-consumer plastic becomes finished furniture:

📹 How POLYWOOD® Furniture Is Made

Understanding what's in the material is step one. Step two is knowing what tools and supplies actually work with it.

What You'll Need to Clean Polywood Furniture

A basic polywood cleaning kit includes a soft-bristle brush, a microfiber cloth or sponge, mild dish soap, warm water, and a garden hose. Skip abrasive scrubbers, eraser pads, ammonia, and acetone-based products, which can dull the surface over time.

Here's what to gather before you start:

• Soft-bristle brush - for textured grooves, joints, and corners

• Microfiber cloth or sponge - for wiping down flat surfaces

• Mild dish soap - the main cleaner for routine dirt

• Bucket of warm water

• Garden hose - for rinsing

• White vinegar - a natural alternative for mold and mildew

• Diluted bleach (optional) - for sanitizing and tougher mildew stains

Keep this list handy, because it covers every cleaning task in this guide - from a quick weekly wipe-down to a deep seasonal clean.

With your supplies ready, here's how to do a standard clean from start to finish.

How to Clean Polywood Furniture (Step-by-Step)

 Routine cleaning involves removing loose debris, wiping surfaces with a mild soap-and-water solution, scrubbing textured areas with a soft-bristle brush, and rinsing thoroughly with a garden hose before letting the piece air-dry completely.

1. Remove loose dirt and dust. Use a dry brush or vacuum to clear surface debris, especially in grooves and joints where dust collects.

2. Mix your cleaning solution. Combine a few drops of mild dish soap with a bucket of warm water.

3. Wipe down all surfaces. Use a soft cloth or sponge to apply the soapy water across the entire piece.

4. Scrub textured areas. Use the soft-bristle brush on grooves, joints, and any built-up grime.

5. Rinse thoroughly. Use a garden hose to remove all soap residue.

6. Air-dry completely. Let the furniture dry fully before use or storage to avoid water spots.

This routine handles everyday dirt and pollen. But damp outdoor conditions can also lead to mold and mildew, which need a slightly different approach.

How to Remove Mold and Mildew from Polywood

Mix one part bleach to two parts water, or use equal parts water and white vinegar as a natural alternative. Apply the solution, let it sit 10–15 minutes, scrub gently with a soft-bristle brush, then rinse and air-dry.

Mold and mildew tend to show up in shaded, damp spots - especially where furniture sits close to walls or fences with poor airflow.

To treat it:

1. Mix your solution: 1 part bleach to 2 parts water, or equal parts water and white vinegar if you prefer a natural option.

2. Apply the solution directly to the affected area.

3. Let it sit for 10–15 minutes to break down the mold and mildew spores.

4. Scrub gently with a soft-bristle brush.

5. Rinse thoroughly with a garden hose and let the piece air-dry.

If you go the bleach route, wear gloves and never mix bleach with other cleaning products.

Mold is one common problem - but grease, hard water, and sticky residue each need their own treatment.

How to Remove Tough Stains from Polywood

Different stains need different solutions: grease responds to warm water and mild detergent, hard-water spots lift with diluted vinegar, and sap or tar usually needs a gentle rubbing-alcohol application followed by a thorough rinse.

Grease and Oil Stains

Mix warm water with a mild detergent and apply it directly to the stain. Let it sit briefly, then scrub gently with a soft-bristle brush before rinsing.

Hard Water Spots

Hard water spots (common with sprinkler overspray) usually lift with a diluted white vinegar solution. Apply, let it sit a few minutes, then wipe clean and rinse.

Sap, Tar, and Sticky Residue

For sap or tar, dab a small amount of rubbing alcohol onto a cloth and gently work at the spot. Rinse thoroughly afterward, since alcohol left to sit too long can dull the surface.

For deeper, whole-piece cleaning beyond spot treatment, a pressure washer can speed things up - as long as you use the right settings.

Can You Pressure Wash Polywood Furniture?

Yes - polywood can be pressure washed at low pressure, generally no more than 1,500 PSI with a wide fan tip, holding the nozzle about 8 inches from the surface to avoid marring the texture.

Pressure washing works well for a deep, all-over clean, especially before storing furniture for the season. A few guardrails matter here:

• Keep pressure at or under 1,500 PSI

• Use a wide fan tip rather than a narrow, concentrated stream

• Hold the nozzle roughly 8 inches from the surface

• Move in slow, even sweeps rather than holding the spray in one spot

• Add a mild detergent to the washer's dispenser for tougher, all-over grime

For a closer look at manufacturer pressure-washing specs and how they compare across HDPE brands, see our breakdown in POLYWOOD vs. HDPE: What's the Difference?

Pressure washing handles the lumber itself. Cushions and fabric are a different material entirely, and they need a gentler approach.

How to Clean Polywood Furniture Cushions and Fabric

Cushions and pillows use outdoor performance fabric, not HDPE lumber, so they need spot-cleaning only. Never machine wash, dry, or pressure wash cushions - use mild soap, a soft brush, and let them air-dry standing on edge.

If your polywood set includes deep seating pieces - like a deep seating chair, sofa, or loveseat - the matching cushions follow different care rules than the lumber frame:

1. Spot-clean stains with a small amount of mild soap and water.

2. Use a soft brush to gently work the solution into the fabric.

3. Rinse the spot with clean water.

4. Stand cushions on their side or edge so they dry faster and don't trap moisture underneath.

Avoid machine washing, tumble drying, or pressure washing cushions - these can damage the fabric and the foam inside.

If you're outfitting a set with deep seating, Gooddegg's garden seating collection includes chairs, sofas, and loveseats with matching cushions built in.

Knowing what fabric can't handle leads into a broader list of things to avoid across the whole piece - lumber included.

What to Avoid When Cleaning Polywood

Avoid ammonia-based cleaners, acetone, abrasive scrubbers or eraser pads, and full-strength (undiluted) bleach. These can dull the finish, degrade the color-through pigment, or damage textured surfaces with repeated use.

Common mistakes to steer clear of:

• Abrasive eraser pads or scouring pads - manufacturer care guides specifically warn against these on lumber, since they can mar the textured finish (see our POLYWOOD vs. HDPE comparison for manufacturer-specific care notes)

• Ammonia-based cleaners - can react poorly with the plastic's pigment

• Acetone or nail polish remover - too harsh for HDPE surfaces

• Full-strength bleach - always dilute; undiluted bleach is unnecessary and can dry out the surface faster

• Mixing bleach with other cleaning chemicals - never combine cleaning products

Avoiding damage during cleaning is half the equation. Seasonal exposure is the other half.

Seasonal Care: Preparing Polywood Furniture for Winter

Before winter, clean furniture thoroughly, let it dry completely, then either store it indoors or in a sheltered area, or cover it with a fitted furniture cover to prevent trapped moisture and mold growth.

Polywood is built to handle cold weather, but a little seasonal prep goes a long way:

1. Do a full clean and let the piece dry completely - trapped moisture under a cover is what causes mold, not the cold itself.

2. Store furniture indoors, in a garage, or under a covered patio if possible.

3. If storing outdoors, use a breathable, fitted furniture cover rather than a tight plastic wrap.

4. Keep furniture away from direct contact with snow piles or standing water.

This kind of prep also affects how often you'll need to clean once the season changes.

How Often Should You Clean Polywood Furniture?

Wipe down polywood furniture regularly - weekly or biweekly during heavy outdoor use - and do a deeper soap-and-brush clean monthly or seasonally, increasing frequency in humid climates where mold and mildew form faster.

A simple rule of thumb:

• Light wipe-down: weekly or biweekly during active outdoor seasons

• Deep clean: monthly, or at the start and end of each season

• Humid or coastal climates: clean more frequently, since moisture speeds up mold growth

Staying on this kind of schedule is also what protects the furniture's long-term lifespan.

How Long Does Polywood Furniture Last With Proper Care?

With routine cleaning and proper storage, polywood furniture commonly lasts for decades. Manufacturer warranties on genuine HDPE lumber run up to 20 years for qualifying furniture, reflecting the material's resistance to rot, splintering, and insect damage.

Unlike wood, polywood doesn't need sanding, staining, or sealing to hold up over time. Its lifespan mostly comes down to two things: the quality of the original material, and how consistently it's cleaned and stored.

For a detailed look at warranty terms and how they compare across HDPE brands, our POLYWOOD vs. HDPE guide breaks down coverage lengths and what voids a warranty.

With the full care picture in place, here are quick answers to the questions we hear most.

Polywood Furniture Care FAQs

Can I use bleach on polywood furniture? 

Yes, diluted bleach (1 part bleach to 2 parts water) is commonly used to sanitize polywood and remove mold or mildew. Always dilute it and rinse thoroughly afterward.

Does polywood furniture fade in the sun? 

Polywood resists fading better than painted wood because its color runs through the material. However, prolonged direct sun exposure can still cause gradual color change over many years.

Can I pressure wash polywood cushions? 

No. Cushions and fabric should only be spot-cleaned. Pressure washing can damage the fabric and the foam filling inside.

What's the best homemade cleaner for polywood? 

A simple mix of mild dish soap and warm water handles most everyday dirt. For mold or mildew, equal parts water and white vinegar work as a natural alternative to bleach.

Does polywood attract mold more than wood? 

Not inherently - but mold can grow on any surface where moisture sits and airflow is poor. Keeping furniture dry and spaced away from walls reduces the risk.

Final Thoughts

Polywood furniture is built to handle years of outdoor use with very little upkeep. A regular wipe-down, the right cleaner for the job, and some basic seasonal prep are really all it takes to keep it looking new.

If you're adding to your outdoor space, browse Gooddegg's Adirondack Chairs, PolyLumber Tables, and garden seating with deep seat cushions - all built from the same weather-resistant HDPE lumber covered in this guide.