My hull has quite a bit of residual film/spotting on the hull from being acid washed last fall. I always polish & wax it before the start of each season, but my pad is getting extremely dirty and is loading up. I have never had this problem, and think it is because it wasn't rinsed properly after the acid washing. Plain water doesn't work. What can I use to remove this film/spotting? I don't have a problem with using something that will strip the wax, as I will be waxing it before I put it in the water