I cannot determine why our upstairs shower has a sulfur smell after it's been used. I've snaked the drain and it's clear, have tried drano (but it's not backed up so I'm pretty sure this was useless) and have tried pouring bleach down the drain (not sure if this helped as the bleach smell was very strong for a day). The smell only occurs after soap or shampoo has been used, not if we just run the water. This shower is used daily. No other taps in the house produce this smell. I'm not sure what to try next, any suggestions?
nmc

Try that same soap and shampoo in another bath, did the smell travel to this room too?