Cleaning a hard to clean aquarium

ovrmyhdagn

Member
I originally used a kent scraper to get the coralline off of a tank htat I bought. Thn went back over it with a razor blade which cleaned a great deal off. But there aer still areas that look like water stained or marked that won't scrap with a razor.
Is there a solution that I can use to clean it that is safe for the aquarium? I tried vinegar and water with no luck.
 
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