Bleach then seal grout?

Bacardi 151

I have either ceramic or porcelain GLAZED tiles...Have kinda a light gray grout but have has some puppy accidents and it's turned the grout dark gray. Technically I don't care what color the grout is, I just want it uniform. What methods can I do? My 15min google search had everything from hydrogen peroxide to an industrial cleaner. I have approx. 300sq/ft and 12" tiles...

I'm hoping there's a somewhat inexpensive solution that doesn't require extensive scrubing. Does a product or household cleaner exist? Also, after the grout is cleaned, how long do I have to wait to seal it? Any recommendations of a sealer?

poppameth

Oxyclean works better than you'd expect for this. However, I'd recommend a grout dye from Aquamix. It'll dye the grout whatever color you want it and seal it with an epoxy solution to keep it from staining again.