How to Clean a Conservatory Roof
Updated: 10 hours ago
To clean a conservatory roof, work from the ground with a telescopic water-fed pole and a soft brush, use plain water or a mild detergent, rinse well and never stand on the glazing. Twice a year is enough for most roofs, with an extra pass in autumn if trees overhang. The aim is to remove dirt without touching the seals, the coatings on the glass or the finish on the frames, because those are what keep the roof performing.
A clean roof is not just about looks. Moss and debris in the gutters and along the glazing bars hold water against the seals, and that is how a roof that was sound begins to leak. The glass, frames and seasonal checks for the rest of the room are covered in our guide to conservatory cleaning and maintenance.
How do you clean a conservatory roof without going on it?
With a pole, from the ground. You will need:
A telescopic water-fed pole with a soft brush head.
A bucket of warm water with a little mild washing-up liquid.
A hose for rinsing.
A gutter scoop or gloves, and a soft microfibre cloth on a pole for the inside.
Then work through the roof in this order:
Clear the gutters first, so the water you use has somewhere to go.
Rinse the roof to float loose grit off before any brushing, so it is not dragged across the glass.
Brush one bay at a time, from the ridge or wall end down towards the gutter, with the soft brush and mild detergent.
Rinse each bay before it dries, working in the shade or early in the day so detergent does not streak on warm glass.
Brush along the glazing bars and cappings to lift debris trapped against the seals.
Flush the gutter and check the downpipe runs clear.
Never stand, kneel or lean on the roof glazing. Glass roofs are designed to take wind, snow and rain, not a person's weight on one pane, and a slip on a wet roof is the most common way conservatory cleaning goes wrong. If a section cannot be reached from the ground, use a ladder against the house wall, not the conservatory, or call a professional cleaner with the right access equipment.
What should you use to clean conservatory roof glass?
Water, a soft brush and, if needed, a mild washing-up liquid diluted well. Rinse thoroughly. Avoid anything abrasive, anything that contains solvents and any pressure washer set high enough to force water past the seals. Glazing units are sealed at their edges; a jet aimed at the edge can breach that seal and leave the unit misted permanently.
Modern roof glass often carries coatings: a solar control layer to reduce summer heat, a low-emissivity layer to keep winter warmth in, or a self-cleaning surface that breaks down organic dirt in daylight and lets rain wash it away. They are robust in normal use but not designed for scouring pads or harsh chemicals.
How do you clean a polycarbonate conservatory roof?
Gently, and only with water and a soft brush or cloth. Polycarbonate scratches far more easily than glass and clouds if it meets solvents or strong cleaners. If a polycarbonate roof has yellowed or gone opaque, cleaning will not reverse it (our guide to conservatory roof panels explains why they age); the material has aged, and replacement with glass is the improvement most owners make at that point.
How do you clean the frames, gutters and glazing bars?
The frames take the same mild detergent and soft cloth as the glass. Painted hardwood frames should be washed rather than scrubbed, and the wash is a good moment to look for any hairline cracks in the paint film that need touching in before winter. Aluminium frames are powder coated and need only washing.
The gutters and the tops of the glazing bars are where the work is. Clear leaves and moss by hand or with a gutter tool, flush the gutter through and check the downpipe runs clear. Look along each glazing bar for debris trapped against the cappings and brush it off. This ten minutes does more for the life of the roof than any amount of polishing.
How do you clean a conservatory roof from the inside?
The inside face of roof glass rarely needs more than a wipe with a damp microfibre cloth on a pole, finished with a dry cloth so there are no streaks against the light. Roof blinds should be dusted or vacuumed on a low setting rather than washed, unless the fabric says otherwise; our orangery and conservatory accessories include roof blinds and vents designed to be easy to keep clean.
How often should you clean a conservatory roof?
Twice a year for most houses, in spring and autumn. Add a pass after any storm that brings debris down, and check the gutters monthly in autumn if there are trees nearby. A roof in the shade of a large tree or near a busy road will need more; a roof in open ground with self-cleaning glass may need less. The gutters matter more than the glass: a blocked gutter causes damage, a dusty pane does not.
Should you clean it yourself or hire someone?
Most single-storey roofs can be cleaned safely from the ground with a pole. Hire someone when the roof is out of reach, when the house is tall enough that ladder work is involved, or when the roof is polycarbonate and you would rather not risk scratching it. A professional cleaner who works with conservatories will also spot a slipped capping or a failed seal before it becomes a leak.
A roof kept clean and clear at the gutters lasts longer; our guide to how long conservatories last covers what else matters, and the luxury conservatories we build use frames that wash clean and age well.
Conservatory roof cleaning questions, answered
Can you use a pressure washer on a conservatory roof?
Not at pressure. A pressure washer on a low, fan setting held well back from the glass is usable for rinsing, but never aim it at the edges of the glazing or at the seals. A water-fed pole is safer and does the job.
Does self-cleaning glass mean you never clean the roof?
It means you clean it less. The coating breaks down organic dirt and rain washes it off, but bird droppings, moss at the edges and dirt in dry spells still need an occasional rinse. The gutters still need clearing.
How do you remove green algae from a conservatory roof?
Brush it off wet with a soft brush and mild detergent, then rinse. Algae grows where water sits, so clear the gutters and the low edge of the roof to stop it returning. Avoid bleach and strong biocides on coated glass.
Talk to our design team
Looking after a conservatory roof is a small habit that protects a large investment. If your roof needs more than cleaning, talk to us about your project and we will tell you plainly whether it needs attention or replacement.
