Well this is going to sound odd, but I cleaned the gravel well and then left it in a bucket beside the fish tank it was going to be in. It has been that way for a few weeks and a few days ago I noticed that it looked wet. Upon closer inspection I found that my dumb cats had thought that it was kitty litter and had peed in it. Needless to say I was about to strangle them especially because the gravel costs so much. What I want to know is if there is any point in trying to clean the gravel(if so how) or if it has already absorbed the pee and I should just buy another bag.