... should last between 1 and 3 months, depending on how well you treat it, but once it starts to ... and don't wring it, for maximum life. Can I sterilise the sponge? Yes, feel free to boil the ... In fact even if you do decide you want to use a bath wash, you can use far less product, so no ... tougher skin and cause ingrown hair problems. How frequently should you use the sponge? Every day. Make the sponge ...