Greenhouse and Sunroom Glass

Why the interior grows a film

These rooms combine high humidity, strong light and limited air movement. Condensation runs down the inside of the glass and pools in the frame channels, and algae establishes in that constantly damp margin before spreading across the pane. In a greenhouse with plants and irrigation, it is faster still.

The frame channels matter more than the glass

Water sitting in the bottom channel is what sustains the growth, so cleaning the glass and ignoring the channel means it recolonises from the edge within weeks. Clearing and drying the channels, and checking their drainage holes, is the part that determines how long the result lasts.

Overhead glass is a different job

Sloped and overhead glazing cannot be worked the same way as a vertical pane, and anything dropped or dislodged falls onto whatever is below. On older structures the glazing bars and seals may be fragile enough that pressure is genuinely risky. This needs a careful approach rather than a fast one.

Polycarbonate is not glass

Many enclosures use twin-wall polycarbonate, which scratches far more easily than glass and hazes permanently under abrasives or the wrong solvent. If your panels are plastic rather than glass, that changes what can safely be used, and it is worth saying so when booking.