Ok, I have an experiment for you. Go touch some really hot chili peppers, then wash you hands. With soap. Three times, if you like. Then rub your eyes. Then tell me that felt absolutely fine. Go ahead, I’ll wait.

Capsaicin is non-soluble in water and basically doesn’t wash off.

Again this fake quote? I know it’s justa mindless copy-and-paste, but at least put it into context. Marx never wrote that. Here’s page 651 of the Moore translation, and here’s a discussion of the origin of that quote.