I just use some paper towels and windex after taking out any big bits of nasty by hand. I go over it once or twice with a fresh paper towel soaked in clean water to get rid of any chemical residue. The nice thing about glass cleaner is the fact that it leaves very very little behind after you've used it, since the goal is to leave glass 'streak free'. Just let it air out for a couple of minutes to get rid of any smell and it's golden!

What bedding do you use?