My bathroom tile is 20 yrs old and the grout has darkened over the years. I just had about 5 % of the tiles re-grouted and the grout is white and naturally is different than the original grout. Any suggestions how to make them all look more alike - whiten the old grout or "dirty up" the new grout? If I should try to whiten up the old grout, what products work best? (my son-in-law said he read that the new Clorox pen is pretty good for the job).
Thanks in advance for any help.