We sell that range - The three main products are the cleaner, the re-colourant, and the water-proofer.
The cleaner works in a very similar way to 303 Aerospace cleaner (which we also sell!!) and thus is similarly effective, the water proofer works in a similar way to 303 High-Tech fabric Guard (Which we also sell and it's brilliant stuff!!) The product missing from the 303 range is the re-colourant.
A word of caution though.... You need to be sure that it is the actual roof material that is discoloured and not some white soiling which has built up. The reason I say this is that you don't want to 'colour' dirt which could be effectively cleaned away.... This obviously affects which product(s) you should choose.
As an aside - I would fully recommend either of the aformentioned water proofers....
Cheers - Nick.
www.pro-detailing.co.uk