Today I pulled my bus out for a wash down. I'm driving up for new headlights @ Xtream tomorrow and wanted it to look descent for the trip.. after 2 hours of scrubbing I noticed some black stains under my windows, soap and brush would not pull it off so I tried a ''wet'' Magic eraser under one of the windows and Bam it's gone.<br/>Is this ok for the Gelcoat?? After it dried...