Bump.. never figured this out myself..udually I just scrub it with s scrubby sponge.. gotta b an easier way tho..
I actually think the black silicone looks nice and clean too. I saw a tank one time that almost looked like the glass had a tint also.. but it was clear.. weird.. with black silicone..I've left it there; scrub too hard and silicone starts coming off with the algae so I don't want to take chances. I actually have one tank with black silicone, and while not to everyone's liking, I think it's kinda sharp.
What percentage? And I also tried using H2O2 but no resultsMix excel with water in a spray bottle and spray when doing water changes. Works like a charm.