The streaks being left behind are probably from minerals in your water.
Clean the glass with distilled water. Because distilled water contains no minerals it will not leave spots or streaks on the glass.
Also, you do know not to be using chlorinated water with your frogs, right? If you use tap water you have to treat it with something to remove the chlorine & chloramines which are dangerous to amphibians (and most other small animals).





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