what do people use on these?

normally we leave them alone, but i decided to try some TFR style cleaner on a roof while we washed it, no joy at all, then i had the brainwave the wetvac on a new beetle roof that was supposed to be beige in colour.

never worked either tbh

what do the manufacturers recommend?

 

I just wash them with normal suds and leave them to dry naturally. 303 do a canvas hood kit if I remember correctly, think the Polishing Company do them via www.thepolishingcompany.com.