Most people stop using the conservatory before they ring anybody about it. The panels go green, the light through it turns grey, and then one wet week there is a drip on the sill and the room quietly becomes somewhere to keep the drying rack. Conservatory roof cleaning sorts the first half of that. The drip needs finding rather than washing.
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Conservatory roof cleaning in South Yorkshire
A conservatory roof sits directly under the main house gutter, so it catches everything the roof sheds and everything the gutter spills. Green panels are one job. Water coming in is a different one, and it usually starts somewhere you cannot see from inside.
Conservatory roof cleaning will not fix a leak
They are two different jobs and it saves everyone time to be clear which one you want.
Cleaning is the panels and the glazing bars: growth off the top, the dirty tide line at the edges, and the gutters round it cleared of what has washed down. A polycarbonate roof that has gone green comes back further than people expect, because most of what you are looking at is sitting on top rather than the panel itself having clouded.
A leak is a different exercise. Water is getting past a seal, a glazing bar, the flashing where the roof meets the house, or the gutter behind it. Washing the roof touches none of those, and anyone telling you a clean will stop a drip is guessing.
The gutter you cannot see
Where a conservatory is built against the house, there is usually a gutter running along the join, tucked between the conservatory roof and the wall. You cannot see into it from the ground and you cannot see it at all from inside. It collects everything the main roof sheds, which on a mossy roof is a great deal.
When it silts up, the water backs up and goes over the back edge, which is on the inside of the join rather than the outside. That is why so many conservatory leaks show up at the wall end, and why they get blamed on the seals. Clearing that gutter is often the entire repair.
What a blocked box gutter looks like
This is a factory gutter, not a conservatory, but it fails in exactly the same way and it is the only one you can get a photograph of. 
The same run cleared back to bare metal. On a conservatory this is often the whole repair.
What is usually behind the leak
- A drip at the wall end after heavy rain. Nearly always the gutter behind, not the panels.
- Water tracking down the inside of a glazing bar. The seal or the end cap on that bar has gone.
- A wet patch only in wind driven rain. The flashing where the roof meets the house.
- Staining along one panel edge. The panel has slipped in its bar, or the capping has lifted.
- Green inside the panel rather than on top. Algae in the flutes of twin wall polycarbonate. That does not wash out.
Questions about conservatory roofs
Can a polycarbonate roof be cleaned without cracking it?
Yes, so long as nobody stands on it. Polycarbonate is not a surface anyone should put weight on, whatever it feels like from below. It gets done from a ladder or from above with a pole, never by walking about on the panels.
How soon will it go green again?
Faster than a house roof, unfortunately. A conservatory roof is shallow, it sits in the shade of the house for part of the day, and everything off the main roof lands on it. Somewhere between one and three years is realistic depending on how much is overhanging it.
Mine is glass rather than plastic. Is that different?
Glass cleans up better and it will not go cloudy or grow algae inside itself the way twin wall polycarbonate does. The bars, the seals and the gutter behind it all age the same, so a glass roof leaks for the same reasons a plastic one does.
What if the roof is past cleaning and needs replacing?
Then you want a conservatory firm rather than me. Replacing a roof is a different trade and I am not going to pretend otherwise. What I can do is tell you honestly whether yours is genuinely finished or whether it is dirty, because those look surprisingly similar from underneath.
Where exactly is the drip?
Before you ring anybody, notice where the water actually comes in: at the wall where the conservatory joins the house, or out in the middle of the roof. That one detail separates two completely different jobs and it can save a visit.
Then send a photo to 07515 154559 on WhatsApp, taken from an upstairs window if you have one looking down on it. That is the only view that shows the roof and the gutter behind it together. I cover Mexborough out to twenty miles, so Rotherham, Doncaster, Barnsley, Sheffield and the Dearne Valley towns, and I answer between 8am and 6pm on weekdays. If moss off the house roof is what keeps filling it, start with gutter clearing. Everything else is under services.
Want it looked at?
I come out and look before I price anything. Free quote, no call out fee.