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How do i clean up a polyurethane stain from a composite deck?

Asked June 30, 2018 by a homeowner in Paint Removal and Cleaning (Faye Cassell)

Long story short, I moved into a new condo yesterday, had my interior floors screened, and the floor guys left noticeable stains on the shared front porch (composite decking).

I've called the floor guys to clean it up but

a) they aren't making it a high priority

b) I'm worried they'll do a bad job of cleaning and I'll have to finish it myself anyway.

I want to make sure this gets done well since my literal first introduction to my upstairs neighbor was him pointing out the stains (oops). I'd like to make a better first impression than that as a new neighbor:-/

What's the best way for me to clean up noticeable poly stains of the deck without doing more damage?

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    VNOC Handy ServicesContractorAugust 26, 2026

    To clean polyurethane stains from a composite deck, you'll need to be cautious to avoid damaging the decking material. Here’s a step-by-step approach:

    1. **Gather Supplies**: You'll need a plastic scraper, a soft cloth, mineral spirits or a specialized composite deck cleaner, and a bucket of warm water with mild soap.

    2. **Test a Small Area**: Before applying any cleaner, test it on a small, inconspicuous area of the deck to ensure it won’t cause discoloration.

    3. **Scrape Off Excess**: Use the plastic scraper to gently remove any thick layers of the polyurethane. Be careful not to scratch the surface.

    4. **Apply Cleaner**: Dampen a soft cloth with mineral spirits or the composite cleaner and gently rub the stained area. Let it sit for a few minutes to break down the stain.

    5. **Rinse Thoroughly**: After the stain has lifted, rinse the area with warm, soapy water to remove any cleaner residue.

    6. **Dry the Area**: Allow the deck to dry completely before walking on it.

    If the stains are extensive or you’re unsure about doing it yourself, consider hiring a professional who specializes in deck cleaning. Costs for professional cleaning can range from $100 to $300, depending on your location and the extent of the staining.

    As a next step, you might want to get 2–3 local quotes on Handyman.com to find a reliable service.

    — Assisted answer

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