You have two choices for this job; Industrial Strength Algae Strip and Green Genie. Both will do the same job but Green Genie is easier to work with as it is not fuming and uses salt instead of acid to do the work. Both are environment friendly. The difference is that Green Genie takes a bit longer to work which can be an advantage as the longer you let the chemical soak into the adhesive rings, the easier they will be to remove.
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