After repainting my CLC stitch-N-glue this spring, I took boat to a new place...the Chatahoochee River. Sadly, I discovered that while boat was sitting half on bank, half in water, the clay on the river bottom and whatever was suspended and got stirred up, left big orange clay lines on boat...much of it seems to be concentrated at the water line. Anyway, regular dishpan soap and lots of elbow grease seem unable to remove this unsightly blemish. I guess because clay is made up of such fine particles, it has infiltrated my paint. Are there any cleaners that might be able to take care of this. Any suggestions?

Thanks, Dave Walker