I have a White's Dumpy Tree frog whose tank I want to clean while I'm home for break. I have a solution of frog safe cleaner from the store, but it doesn't do very well when it comes to the dried frog skin on the glass. The tank is also one of those where it opens at the front of the tank, just not all the way to the bottom, which makes it very difficult to clean. What's the best way to clean a tank that gets rid of dried skin and water stains, but doesn't use harsh chemicals?