Jo, Soak them over night in cold Chlorine water. A concentrated solution can be found in any supermarket - usually in a flexible recharge type plastic container. This is diluted according to the instructions - 1 of conc. solution to 10 of water, if I remember well. This will break up the propolis, wax and clear any other material - as well as disinfecting the leather. Rinse well next morning. It will slightly bleach the pig skin - but will not in my experience cause any problem to the gloves. Mine get the treatment at least once a week in the season. At the end of which they are usually discarded. Peter