It's the rumor that dropping a raw potato into an over-salted soup will "draw out" some of the salt. Sorry to break it to you, but this myth is 100% that -- a myth. Busted

While raw potatoes do indeed draw out some of the salt from a liquid, they also absorb a proportionate amount of liquid. Sorry, spud. If you dish is too salty, and dilution isn't helping, sweetness is usually the best way to balance it out.