I generally use a detergent and hot water mixture for the hides which are cork. And then make sure its thoroughly washed off and air dry. It's sometimes good to have more than 1 set of very similar hides so you can put your snake away with hides asap (especially if it's small + scared) whilst you're still drying the ones you've just washed maybe, especially if you're using ones brought in from outside. It's really worried me now with that story about ants, I HATE ants!!!