I've heard that putting a Vitamin C tablet in your bath works but as I just have a shower that wouldn't do me. Adding 1 tbs vinegar or 2 teaso citric acid to 2 litre of water for hair and body rinsing, is another. Citric acid (1/2 tsp), and bicarb (1/4 tso) are what makes up Alka-Selzer type tummy calmer. Citric acid is also freely available in supermarkets.
I have a shower at the pool, hair and body and another, thorough shower that night. Nothing seems to get the smell out of my cozzie though, even after several washings.