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Hard Water Stains
Bar keepers friend definitely helps alot!
My filter was dripping from the back of the tank down the glass which I thought was the tank leaking which left very hard water stains on the glass that where very difficult to get out.what I found out worked great was toothpaste and baking soda I mixed toothpaste and baking soda smeared it on the glass and with a damp magic eraser vigorously wiped back and forth then cleaned the mix off with a wet paper towel ,you might have to do it a few times but it worked pretty good.