Roof cleaning tips...

[AllTorque]

The other day, a bird crapped on my Griff roof (no not my girlfriend!), but all I could get hold of to clean it off were some paper towels and some water. The towels got rid of the goo, but sort of shredded themselves into the material of the roof, so I now have a horrible looking whitish patch on the roof which no amount of washing or cleaning seems to get rid of. Has anyone got any tips for getting rid of it, or should I just cover the whole roof in that Renovo stuff, which the previous owner kindly left me in the boot? Hope someone can aid my dilemna.

PS Damn fine week-end for roof-off motoring what!?! Ding dong!