The only thing that ever worked on mine was a very mild bleach solution and scrubbing. Always took a couple of times and make sure you rinse after each scrub real well. It'll work !
I've tried apple cider vinegar, unsuccessfully, what else may eliminate mold/mildew from a blue neoprene diving wet suit?
Bleach
Spray it with lysol & hang it in the sun for a short time.