After a nearby boat was sand blasted with less than effective tenting, my boat was covered in a very fine dust which appears to have ingrained itself into the gelcoat. On flat surfaces it can be removed by compounding, but on the none slip obviously this is not an option.
After trying a range of marine and domestic products to clean it up, the one that appears to be most effecient is ammonia. We have so far just tried small test areas; does anybody know whether there is a downside to using ammonia on fibreglass? I am particularly concerned about any effect on my dark blue hull.