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It’s the osmotic effect of a strong solution that helps with the cleaning and a small amount of iodine in the salt won’t make any difference. You can use iodized sea salt, but honestly speaking from personal experience it just irritates your piercing more than anything. I found i would use the iodized salt twice a day and my piercing would be inflamed and swollen, and then i’d end up giving up on cleaning it all together and it would magically heal up nicely. No, it does not have to be sea salt (as neil degrasse tyson will tell you, all salt is sea salt), but it you should be using a pure saltwater solution to clean your piercing.