Generally I have found any PVC marking to be reef safe but if you want to make your pvc clean and shiny pick yourself up a somewhat coarse rag or Terry cloth and some acetone (or acetone based nail polish remover in a pinch) give it a nice form scrub and all writing/printing normally comes off.
Generally I have found any PVC marking to be reef safe but if you want to make your pvc clean and shiny pick yourself up a somewhat coarse rag or Terry cloth and some acetone (or acetone based nail polish remover in a pinch) give it a nice form scrub and all writing/printing normally comes off.