Just don't press too hard, they become more fragile when wet (I have broke a panel that way with surprisingly little force). Make sure they are 100% dry before you oil them up.
Btw.. the products mention by the experienced gentlemen above is probably great. But if you like me, live in a place where they are not available.. I have had succsess using baby soap with a netural Ph and a soft baby tooth brush. After all.. they are my babies
