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can you define dirty? I think a mag float is a must for every tank, but it may be something you can change to fix the problem rather than just scraping it away every week.
A mag float is a great little tool... it's two pieces. One goes inside the tank and the other goes outside. It's magnetic so as you move the piece on the outside, the one on the inside follows, scraping the glass. Here's a link to one of the many sites google brought up- Mag Float aquarium products online – Pet Mountain ... they're invaluable IMO