Depending on exactly how crusted it is on the glass.. you might be able to get away with buying a Dawn Power Dish brush... they are amazing ... I am pretty sure it would do the trick.. it's full submersible.. but you will go through batteries fairly quick. I would seriously think about it... they're cheap, electronic, and obviously fast.. push the button and the brush tip spins around ... I have used one since I setup my reef and I will always use one now
Scott
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