Quote Originally Posted by s0litarys0ldier View Post
Friends my workshop is in the basement. I had used my stones and put them away wet to dry. The lights were off down there and it’s pretty cool. Anyways long story short. I came back 3 days later and two had mold on the surface. How would I remove this without damaging the stone and without it being hazardous to human health?

Thank you. I now bring them upstairs to dry. Not a huge water stone guy as you may have noticed by now.
While I've never had this problem, I would just scrub them with a nylon brush, let them dry and forget about it.

If they are Norton Water Stones, mix a tablespoon of regular plain clorine bleach in a gallon of distilled water and keep those in the bleach water. I've done that for years and it doesn't hurt the stones in the least.