The answer to 'tile and grout cleaning smells bad' is that a foul odor from tile and grout is often caused by mold, mildew, or bacteria buildup. This can happen when the grout and tile surfaces are not properly cleaned and maintained. The smell is a sign that there is an unhealthy microbial growth in the porous grout material.
To fix this issue, you'll need to thoroughly clean the tile and grout using a specialized cleaner designed to kill mold and bacteria. Scrubbing the surfaces with a stiff brush can also help dislodge any built-up grime. If the smell persists after cleaning, you may need to re-seal the grout to prevent future microbial growth.