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I use a razor blade to get right up next to the silicone. algae wipes off my silicon, but if yours is a little touch, try a toothbrush. you don't wanna damage that silicone with anything too abrasive.
I just use an old credit card. A toothbrush would be good too. With the cc I just scrape the glass around the silicone and then I use the corner of the cc to go up and down the silicone.