Is this a proven solution to the problem?My fibreglass high top has black sealant running all the way around it and I have the same problem with the black colour leaching out and forming streaks. Easy enough to get rid of when washing but a PITA and I’d like a more long term solution.Try some isopropyl alcohol
Try a cutting compound such as G3 - or T cut type compound and then polish after, this will work. Link belowHi. This is weird. Just noticed that all around the van black marks have appeared that look like it’s running water stains. We have tried everything to get them off but not shifting. Any ideas please ???? They honestly won’t shift and ate all around where windows are.
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