You should clean your strapless strap-on after every use. Use mild hand-soap and water to do this. Any soap that is gentle enough for your hands is gentle enough or your dildo - doesn't matter the brand. You can also use a toy cleaner as this is specifically formulated for sex toys and will be gentle on your strapless strap-on. If you're sharing the dildo or using it from the vagina to the anus, it is important to disinfect it by boiling it (for a few minutes). This will get rid of any bacteria that could be transferred from person to person or hole to hole. You should also boil your dildos occasionally, even if you're not sharing them, just to make sure there are no lingering pathogens on its surface.