Pink Coaming Pads?????

[pair of jacks]

I've attached a photo of my coaming pads which have developed pink blotches. I'm told this is a type of mold from the inside. The guy who made them specifically made the bottom of the pad with mesh screen so the foam can drain and dry but still got the pink. I know of no cleaner that removes this pink color- so, does anybody else have experience with this happening to them? Is there a better grade of vinyl that this won't happen with? I've removed the foam and completely dried it but I can't seem to stop this.