How to Clean a Composite Door
Written by Cornwall Composite DoorsReviewed by Cornwall Composite Doors installersLast updated July 20264 minute read
Short answer
Clean a composite door with warm water and a mild washing-up liquid solution, applied with a soft cloth or sponge. Rinse with clean water and dry with a lint-free cloth. Avoid abrasive pads, solvents, bleach or silicone-based polishes, as these can dull or damage the GRP skin's protective finish.
Composite doors are designed to be low maintenance, but a proper clean now and then keeps the woodgrain finish looking sharp and helps you spot any early issues. Here's the safe way to do it, and what to avoid.
What you'll need
You don't need any specialist products. A bucket of warm water, a squeeze of mild washing-up liquid, a soft cloth or sponge, and a clean dry cloth for finishing is all it takes. Keep a separate soft brush for door furniture recesses if needed.
- Warm water and mild washing-up liquid
- Soft cloth or sponge
- Clean, dry lint-free cloth
- Soft brush for tight areas (optional)
Cleaning the door slab
Wipe the whole door down with your soapy water solution, working in the direction of the woodgrain. This lifts dirt, pollen and traffic grime without scrubbing. Rinse with a cloth dampened in clean water to remove any soap residue, then dry with a soft cloth to prevent water spotting.
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What to avoid
Never use abrasive pads, scouring powders, solvents, white spirit or bleach-based cleaners on the door skin — these can strip the surface finish and dull the colour permanently. Silicone-based polishes should also be avoided as they can leave a residue that attracts dust and interferes with future refinishing.
Glass and letterplates
Clean glazed panels with a standard glass cleaner and a soft cloth, avoiding excess spray on surrounding frames or seals. Letterplates, knockers and other fittings can be wiped with the same mild soapy solution used on the door — see our dedicated glass cleaning guide for more detail.
How often to clean
A wipe-down every few weeks keeps the door looking its best, and a more thorough clean every couple of months is plenty for most homes. Properties near the coast benefit from more frequent rinsing to remove salt deposits, which we cover in our coastal care guide.
Frequently asked questions
Can I use a pressure washer on a composite door?
We wouldn't recommend it. High-pressure water can force moisture into seals, hinges and locks, potentially causing damage over time. A soft cloth and warm soapy water is safer and just as effective for regular cleaning.
Is it safe to use furniture polish on a composite door?
No. Furniture polish and silicone sprays aren't designed for GRP door skins and can leave a greasy film that attracts dirt. Stick to mild soapy water and a soft cloth for the best long-term finish.
My door has a stubborn mark that won't wipe off — what now?
Try warm soapy water and a soft cloth a couple of times before considering anything stronger. If a mark persists, it's worth asking a professional to look at it rather than risk the finish with stronger products.
Does cleaning affect the guarantee?
Using the correct cleaning method helps protect your guarantee, whereas damage caused by abrasive cleaners or solvents may not be covered. Our 10-year written guarantee covers manufacturing defects, not damage from incorrect care.
Explore next
More maintenance advice
- Do Composite Doors Fade?Colour on a composite door can change gradually with years of sun exposure, but it's a slow process and rarely uniform.
- Cleaning Door Glass ProperlyDoor glazing needs a slightly different approach to the door slab itself, especially where decorative leadwork is involved.
- Caring for Composite Doors by the CoastCornwall's coastal air is beautiful to live in but tougher on exterior doors, so a little extra care goes a long way.
