dont be too hasty in dumping a $250 wetsuit.... if the suit is in good condition then wash it in a tub by soaking.... wetsuits are commonly found for rent in dive shops and no one has ever died or gotten ill from the poor quality of care they get....
as the suit is used, the water flushes thru it slowly as you move thru the water so they are kinda being washed everytime you are in the water. the only thing missing is the soap.
and as I have already said, and any other diver will also tell you, its not the human factor that is the dirty part of a wetsuit, (no matter if someone did pee in it at some time in the past), but its the organisims that are in the water that the suit was used in....
if the suit does not get washed after each use, the dead organisims will begin to smell....so if it doesnt currently have a rank odor, its already been washed after its last use.
if it does have a smell other than the rubber/neoprene smell, a good soaking in a solution of simple green, dawn dishwashing soap or shampoo will disolve any traces of body oils and neutralize the smell of the dead organisims and help to wash them out. you can rinse it afterwards or let it dry that way. when you dive it, the ocean/lake/river water with all of its parasitic organisims will rinse the soap from it
machine washing is a futile attempt and will only serve to wear and scuff the outer material on the neoprene, but soaking in a tub or barrel with your weight belt on top of it will be sufficient.... and if you dont have a weight belt, you wont be diving it anyway, cuz you will float like a cork!
