Even without touching soap, shampoo and other products, showering with a watch is not recommended since the seal can get dry and produce leaks because of the high temperature water.

I’ve used regular non smart waterproof watches all my life (before switching to an Apple Watch) and I used to shower with them until once that I went to replace the battery and the person doing the work immediately noticed the dried seals and told me I shouldn’t shower with the watch and share the reason why.