What she said ^^^^^^^. Krylon fusion spray paint has worked well for me so far. Just clean with an ammonia based cleaner (think Windex) and then paint. Just make sure that you aren't using ammonia free glass cleaner like I did at first. Luckily I realized my mistake before painting. I bought the paint at Walmart and used what just about everyone was recommending....Krylon Fusion in satin black. Turned out very nice.
Greater love hath no man than this, that he lay down his life for his friends - John 15:13