Just as rough scrubbing damages grout, cleaning agents can also harm the sand-based porous material. Chemicals inevitably left within the grout's pores after cleaning break it down over time. ... Also, using dirty or discolored water on grout will only make the porous substance pick up more gross and gray material.

Is it worth getting grout cleaned?

It's recommended to have your tile and grout cleaned at least once a year. If you have kids or pets who get your tile dirty quicker, twice a year might be better for your family. Regular cleanings will keep your tile clean, healthy, and in good condition.

What do professionals use to clean grout?

A: whether you believe it or not, most professionals use a solution of white vinegar and water with a 1:1 ratio. This solution is often more effective than dedicated Ph-neutral grout cleaners.