S.C.
I use the Clorox Anywhere Hard Surface spray. I'm sure that would work to clean the bottom and the top of the rails. I use it on my dd's highchair. I just spray it on, let it sit for a minute or two, then wipe it off. She eats food straight off the highchair and it doesn't bother her or anything. It does smell like bleach, but only when it's wet. I wouldn't wash it outside. I think that there are probably metal parts and you don't want them to rust. Congrats on the baby!