Urine is INCREDIBLY difficult to get out and yes it does seep to the padding below. I use a product called "Anti-Icky Poo", their literature is fantastic and they have a device to inject their product into the padding, all reasonably priced IMHO. It's an enzyme/live bacteria solution. I don't pretend it's a "cure all". I had a dog on pred who urinated EVERYWHERE. I'm managed to save everything but one rug which she would pee on every night while I was sleeping. I get it from my vet (it's available through distributors only) I've never seen it anywhere else but the company that makes it is called Mr. Max. Dawn [Posted in FML issue 4135]