Why it happens
Conservatory roofs collect organic film and algae because they are shallow, shaded in places and rarely rained clean. Frames pick up traffic film and oxidise where they face the weather.
What to do about it
Low pressure, right chemistry, from the top.
- Clear roof debris and gutters first, since everything washes downward
- Use low pressure on glazing bars and seals — never a concentrated nozzle
- Choose uPVC-safe chemistry; abrasives and solvents dull the surface permanently
- Clean frames, then glass, then the surrounding hard surfaces in that order
- Rinse thoroughly so no residue dries on the glass
- Check seals and trims while you are there — early problems are cheap to fix
The mistake to avoid
Do not run a pressure washer at full pressure along a glazing seal. Water forced past the seal ends up inside the unit and causes misting you cannot clean.
How we handle it
Years of dirt, moss and algae lift off with proper pressure washing. We use adjustable-pressure gear that cleans block paving, patio slabs, decking, render and stonework without damaging the surface.
- Rotary surface cleaner on paving
- Adjustable turbo nozzle on stone
- Sodium hypochlorite on algae (rinsed)
- Kiln-dried sand for re-jointing
The service behind this guide
Driveways, patios, decking and exterior surfaces restored.
See Jet Washing