Ive been living in my house for 2 years now. Last spring we began to smell mold coming from kitchen sink drain. several months later it went away. We tried baking soda and vinegar and drain cleaner but it didnt work. During winter I renovated kitchen, sink and drains included. The smell is back this spring. I can now smell it in the bathroom sink. Where exactly is this smell coming from.
Mold can develop and line the sides of drain pipes.
When cleaning anything including baby diapers, it is better to sweep off or scrape off as much solid and semisolid material as you can first. (1) Less cleaning fluid or detergent needs to be used, (2) Less of a mushy mess which in turn means that bleaches or disinfectants will be more effective.