First you need to do an initial cleaning with white vinegar and water with some elbow grease using a magic eraser. Then he will clean the remaining limescale deposits with repeated sprays and again with an eraser. My windscreen now looks great and was very dirty after about 10 years. I start with a 40 gallon reef glass tank. I used a mixture of 1 part vinegar and 2 parts water using a spray bottle. Just make sure there are no ingredients in the magic eraser. I constantly use an eraser in my aquariums to clean the glass.
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