A good brushing and a bleach dip should work fine. I've always cleaned my rocks in this order: brush, bleach, boil, bleach, boil, brush and rinse the bleep out of them. Kind of overkill if you ask me, but I want to be safe.
Really, if you can't boil, give it a good brushing and use a diluted bleach solution. The key is to give it a VERY good rinsing in clean water.
Really, if you can't boil, give it a good brushing and use a diluted bleach solution. The key is to give it a VERY good rinsing in clean water.