A simple white vinegar wash is a good solution for non porous tile surfaces while marble or other porous stone surfaces are more safely cleaned using plain water or cleaning products specifically formulated for stone to avoid damaging the color or finish.
Cleaning bathroom tile grout with vinegar.
Vinegar can effectively clean grout when applied at full strength or when diluted with.
Let the vinegar sit for 10 minutes.
After applying the vinegar wait ten minutes before moving on to the next step.
If you are trying to clean grout on a vertical surface a spray bottle is probably your best bet.
Vinegar grout cleaner 1 cup of water 1 cup white vinegar spray bottle scrub brush.
After you pour the vinegar along the tiled edges allow the vinegar to soak into.
Scoop baking soda into a mixing bowl.
Pour vinegar along tile edges.
Scrub the grout with a toothbrush.
Use a vinegar soaked cloth or a spray bottle filled with vinegar to coat the grout you wish to get clean.
Apply vinegar to the grout.