Sometimes regular cleaners just can’t get the job done, but you still don’t want all the unnecessary chemicals found in commercial cleaners. Here is how to make a heavy duty version at home.
1 tsp household ammonia
1/4 cup hydrogen peroxide
3/4 cup water
Combine well in a bowl. Pour small amounts onto the grout, or saturate towel and press to grout on a wall, so grout is saturated with the solution. Scrub with stiff-bristled brush (being careful to check that tile cannot be scratched. Allow it to sit for several minutes then rinse well with warm water. Repeat if needed.