Do you have an exhaust fan in the shower and if so how long do you let it run after showering?
Being built in the 60's there is definitely a possibility of issues behind the tile. Cut some sheets of plastic and tape them over all of the tile. OK to continue to use the shower, but see if the smell decreases. Then open a section of the plastic and smell behind it. This may help target the source.
Bud
Being built in the 60's there is definitely a possibility of issues behind the tile. Cut some sheets of plastic and tape them over all of the tile. OK to continue to use the shower, but see if the smell decreases. Then open a section of the plastic and smell behind it. This may help target the source.
Bud