Cleaning Guides
How to Clean Composite Doors
Composite doors are genuinely low-maintenance, but "low" isn't "none" — the wrong product can do more damage than years of weather ever would. Here's how to clean one properly, and what to actually avoid.
The method
Wipe away loose dirt first
A soft cloth or sponge removes surface dust and debris before anything wet touches the door, which stops grit from being dragged across the surface as you clean.
Clean with warm water and a pH-neutral solution
A mild detergent, or a specialist composite door cleaner, mixed into warm water handles most everyday grime. Work in small sections with a soft cloth or sponge, using a soft-bristled brush to get into textured or woodgrain grooves.
Rinse thoroughly
Clean water removes every trace of cleaning solution — leftover residue can leave its own dull film if it's allowed to dry on the surface.
Dry with a soft cloth
A microfibre or lint-free towel prevents water spots and streaking, particularly on darker colours where marks show more.
Dealing with specific stains
Bird droppings and sap usually soften with a bit of warm water and a few minutes to sit before wiping. For anything more stubborn — paint, ground-in dirt, mineral staining — a specialist composite door cleaner designed for GRP surfaces works safely; always test an inconspicuous area first and follow the product's instructions rather than assuming a general-purpose cleaner will behave the same way.
Fading and chalky surfaces
Years of direct sun, especially on south-facing doors, can leave the GRP surface looking dull, chalky, or slightly milky — this is UV oxidation, not dirt, and no amount of cleaning will fully reverse it. Regular cleaning slows it down and keeps the surface in better condition for longer, but once genuine fading has set in, it needs a dedicated composite door restorer rather than a stronger cleaning product.
Never use car wax to fix a dull or faded door. It's a common instinct, but wax dries white and gets permanently trapped in textured woodgrain finishes — a mistake that's far harder to undo than the fading it was meant to fix. If your door has genuinely faded, look specifically for a composite door restorer product rather than reaching for anything in the garage.
What to avoid entirely
A pressure washer in particular is worth calling out specifically, since it's tempting for a quick clean but genuinely risky — high-pressure water can force moisture into locks, hinges and door seals, leading to stiffness or misalignment down the line that's a lot more inconvenient than a dull finish.
Keeping it in good shape
A clean every few months is a reasonable baseline, more often in an urban or high-traffic area where grime builds up faster. Check hinges periodically for looseness, and keep an eye on locks and handles for stiffness — most composite doors come pre-lubricated and don't need routine oiling, but a light silicone-based lubricant is the right fix if you do notice resistance. A doormat and general care around moving furniture goes a long way toward avoiding the scratches and dents that are otherwise hard to fully undo.
The details that get checked at inspection
Door handles, frames and entryways are exactly the kind of detail an inventory clerk looks at closely. Our end of tenancy cleans cover every fixture properly.
Frequently Asked Questions
How often should I clean a composite door?
Every three months is a reasonable baseline, more often in urban or high-traffic areas where grime builds up faster.
Can I use a pressure washer on my composite door?
It's best avoided. High-pressure water can force moisture into seals, locks and hardware, leading to stiffness or misalignment over time.
Why does my composite door look dull or chalky?
Usually UV exposure, especially on south-facing doors — this is surface oxidation, not dirt, so cleaning alone won't fully reverse it. A dedicated composite door restorer is the right product for genuine fading.
Can I use car wax to restore shine to a faded door?
No — this is a common mistake. Wax dries white and gets permanently trapped in textured woodgrain finishes. Use a product designed specifically for composite doors instead.
Do I need to lubricate the locks and hinges regularly?
Usually not — most composite doors come pre-lubricated. If you notice stiffness or squeaking, a light silicone-based lubricant is the right fix rather than routine oiling on a schedule.