Just to add to that, i also think that a lot of the problems with smells in washers and bathrooms or any sinks in the kitchen is due to the lack of cleaning, no disrespect to you or anyone else, we tend to forget the amount of dirty water that enters our waste pipes and without runing hot water down them along with lets say soda on a monthly basis you will get a waste pipe smell, most of us today have showers so by the time the water is going down the plug hole it is cold and the stale soap sticks inside the wast pipe, the same with washers,( sorry i went on so long)