Not usually. Your bathtub will only get dirty from Epsom salts if you take a detox bath every single day for a long period of time (a year or so). Other than that, no marks should remain. And a good scrub each week will ensure that the bath stays in good condition.
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Oh good point! I hadn’t thought about how it may affect the tub. I don’t think you need to worry about it, unless you’re doing it every day without cleaning the tub, like you said!