I mean, they never change or wash their clothes! Ever!
I don't think they even take baths...
I don't think they even take baths...
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And I think there may have even been a sink in there 
And in FFIV there are lakes and rivers in a lot of the towns, where people could bathe the old-fashioned way. However, since some soaps IRL I believe are made from things like flowers, animal fats, and salts, and there are at least two of the three in some FF worlds, I think it's likely that they'd at least be able to make soap even if the heroes didn't ever get a chance to use it
This is particularly true with FFXIII.
But Then again you never see them sweat so maybe sweating and BO don't exist in a fantasy world..
They must be starving to death to. All that epic-ness on an empty stomach, what is there to stink?

Like Sabin in VI on the Phantom Train, there's a whole meal set up there and stuff. And...well I hate to say it, but it has to go somewhere
So naturally they'd have to wash or they would smell bad. And seeing as how sometimes there's some sort of attraction between party members, I doubt they'd want to smell bad if they didn't have to. Old-school soap would be the best thing, salts, animal fats, and flowers, they could even carry it with them, it's not particularly heavy 