I use a small piece of the finest steel wool you can buy, I think it's a grade #0000. I take a small piece, wet it and rinse it well first, tuck the straggley ends (from tearing it off) together to make a ball and....works like a charm not only on my bowfront, but all the tanks. I get some direct sun on all my tanks so I get a big of the spot algae that needs to be scraped every week.