I'm sure this has been covered, but I am in such a rush I don't have time to search.
I'm concerned most about the bacteria. I'm pretty sure the top of the mattress is polyester or something because nothing will soak up in to the paper towel. I did have a mattress pad but it wasn't waterproof, so some of the pee went into that. I put baking soda on it to get rid of the smell and dampness and I will vacuum.
It just drives me nuts that I can't the the pee out that is now deep in the mattress