I don't know what prism color markers are
but if they are like magic markers, I have an idea!!
I bought PURE AYRE from www.kvvet.com
(cheapest place I found, as I always order over $50. and then there is no S/H charge). I use it on CAT PEE SPOTS, or anything else that I don't like the smell of. I have a very sensitive nose.
It is a natural product and literally destroys the smell, AND has a minty remaining scent. The label says it clears: urine, vomit, skunk spray....etc. I mean if it can remove SKUNK it should work on your markers. Maybe just a mist on them so they aren't too wet?
Also, how about those moisture control plastic tubs they sell, for your basement? I can't think of the name of them, but they have crystals in them and the moisture gets sucked into it, and then it becomes a liquid when saturated. I used them a long time ago when I had a condo without a fan vent or window for the shower steam. Walmart sells them.