Haven't had to clean ours yet but if it ever gets really dirty, think I'd consider Renova's range of cleaning products. I used it on my car's canvas soft top and it was brilliant. Got rid of all the dirt & algae, and the plastic window polisher was great too. My roof had gone from an ugly, greenish, faded blue to a brand new, dark blue roof. Bloody hard work though, but worth it. /forums/images/graemlins/cool.gif