... 3 months, depending on how well you treat it, but once it starts to look tired, or starts to ... the sponge dries up, as it shrinks. How long will the sponge last? We get asked this all the time ... to dry, rinse every time its used and don't wring it, for maximum life. Can I sterilise the sponge ... skin. Acne, is the sponge beneficial? Yes, again, it will certainly help. By gently but deeply cleansing, the ...