How to Clean Composite Doors and uPVC Windows Safely and Effectively

Introduction

Composite doors and uPVC windows are popular choices for homeowners due to their durability, energy efficiency and low maintenance requirements. However, regular cleaning is essential to keep them looking their best and functioning properly. In this advice centre article, we explain the best practices for cleaning composite doors and uPVC windows. If you follow us on social media you’ll already be aware of how we highlighting the importance of using gentle cleaning methods, avoiding harsh chemicals (even those marketed as “natural”)

The Best Way to Clean Composite Doors and uPVC Window Frames

The safest and most effective way to clean composite doors and uPVC window frames is with warm, soapy water. Follow these simple steps:

What you’ll need
- A bucket or large bowl of warm water
- A small amount of washing up liquid
- A soft microfiber cloth or sponge
- A non-abrasive brush for stubborn dirt, an old soft toothbrush is perfect
- A dry, lint-free cloth for finishing
Clean the Surfaces
- Dip the cloth or sponge into the soapy water, wringing out any excess liquid to avoid drips.
- Wipe down the door or window frame gently, working from top to bottom. This ensures dirt is removed rather than spread around.
Rinse Thoroughly
- Use clean water to rinse away soap residue, as leftover detergent can leave streaks or attract more dirt.
Dry the Surface
- Finish by drying the door or window frame with a lint-free cloth. This prevents water spots and keeps your fixtures looking pristine.

Why Avoid Harsh Chemical Cleaning Products?

Composite doors and uPVC windows are designed to withstand weathering and daily wear, but their finishes, particularly of coloured window frames can be sensitive to certain cleaning products. Harsh chemicals such as bleach, ammonia, or abrasive powders can strip away protective coatings, dull the surface or cause discolouration over time.

Even products marketed as containing “natural ingredients” can be problematic. For example:

Citrus based cleaners: These often contain acidic compounds that can etch the surface or weaken seals.
Vinegar based solutions: While a common household cleaner, vinegar is an acid and can damage the protective finish on coloured composite doors and uPVC window frames.
Essential oils: Some oil based cleaners, which although they may smell amazing, leave behind residues, that attract dirt or can react poorly with synthetic materials.

Professional window cleaners using water fed poles use purified water rather than any harsh chemicals to clean glass & upvc window frames.

Using harsh chemicals may also damage window and door hardware and void the warranty from your supplier.

The Special Care Needed for Coloured uPVC Window Frames

Coloured uPVC window frames are particularly vulnerable to damage from inappropriate cleaning products. Unlike white uPVC, which may better hide small imperfections, coloured frames can show fading, streaking, or patchiness caused by chemical reactions.

When harsh or inappropriate cleaners are used:

Fading: Strong chemicals or acidic cleaners can break down the pigments in the coloured finish, leading to uneven fading.
Surface Etching: Abrasive substances can create tiny scratches that dull the vibrant appearance of coloured frames.
Seal Deterioration: Harsh chemicals can weaken the seals around windows, compromising energy efficiency and allowing drafts or moisture to seep in.

By sticking to warm, soapy water, you’ll avoid these issues while maintaining the long-lasting beauty of your doors and windows.

Regular Maintenance Tips

In addition to cleaning, keep your composite doors and uPVC windows in excellent condition by:

Lubricating Moving Parts: Apply a small amount of silicone-based lubricant to hinges, locks, and handles every six months to ensure smooth operation.
Inspecting Seals: Check for cracks or gaps in weather seals and replace them if necessary.
Avoiding Pressure Washing: High-pressure jets can force water into seals or damage finishes, so stick to gentle hand cleaning.

Conclusion

Composite doors and uPVC windows are investments in your home’s aesthetics and energy efficiency. By using warm, soapy water and avoiding harsh chemical cleaning products or “natural” cleaners, you can ensure these features stay in top condition for years to come. A little care and attention go a long way in preserving their durability and vibrant appearance. Remember, the key is gentleness your doors and windows will thank you!