HOW TO REMOVE GUINEA PIG URINE STAINS NO FURTHER A MYSTERY

I have only 1 blanket of fleece in the bottom of my cage,but underneath it I use disposable child multi-use pads. Mine are Munchkin model And that i get them in the child dept. at Target.I 'solved' it by laying down a layer of fleece underneath the newspapers, the fleece stays pretty dry, and there is no wetness to the coroplast, so It can be Opera