Actions like washing your palms and showering, whereas carrying an Apple Watch Series 2, 3, or 4, are technically okay. Still, Apple would not suggest exposing your gadget to soaps, shampoos, conditioners, lotions, and perfumes, as these substances can "negatively affect water seals and acoustic membranes" on the device.
But if we talk about Apple Watch Series 4, it has a water resistance score of 50 meters beneath ISO standard 22810:2010. Nevertheless, Apple Watch Series 4 should be used for something other than scuba diving, waterskiing, or different actions involving high-velocity water or submersion under shallow depths.