I just wear my synthetic workout clothes into the shower every day, hang them up, and I get several uses out of them before they start to smell and need to get properly laundered. Synthetic dries quickly, there’s no reason not to just give it a rinse every time you use it. Other than starting to smell faster, it’s vastly superior in performance to hydrophilic fibers like cotton. Only thing better is wool, but that requires cruelty, violence, and other abuses of vulnerable individuals.