last wheeling trip i aired down to 15 psi, while out there darkshadow pointed out i had a leaky bead on the left rear. after driving around a while it stoped leaking. at the gas station while airing up my right front was leaking. i drove home thinking it would go away, well it didn't. i took the tire to my buddy who has a tire machine, broke it down and there was mud all over the bead. this was last monday, yesterday i went out and the 3 other tires are very soft with the left rear totally flat. i suspect i have mud on those beads also. this was the first time i aired down in mud and now i don't want to do it again. is there anyway i can keep the mud out so i don't have to take the tire off and clean the bead everytime?