Our conservatory roof is made from Everlite. The problem we have is that where the roof runs into the drain is constantly filling up with soil, stones and moss. I have no idea where it's all coming from, but my question is: is there a way to prevent this? It's very difficult to properly clear out the gap (as it's note very big), and the clogging causes the water to back up on the roof.
There are devices called gutter guards that allow the water to enter the gutter/drain but the debris continues over the gutter and off the edge of the roof. Not sure if you could get one of those for your conservatory roof but you might try looking into them.