Rav Moshe says it’s okay to shower if you’re hot and sweaty. here is his lashon from igros moshe even haezer 4:84–
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This wasn’t rav moshe’s chiddush; the aruch hashulchan (orach chaim 551:37) says the same thing. Chazon Ish is machmir not to shower at all, though. so you are allowed to shower, if your minhag is to hold like r’ moshe, and not the Chazon Ish.