Grout re-colorant suggestion?

[Toonces]

I've got some 8 year old sanded bathroom floor grout that started out white but has gotten dingy over the years. It's 1" hexagon tile so it would be impossible to scrub all those lines.

What's a good brand and product for recoloring my grout back to white? It's been a while since I've looked into grout cleaning products and I'm guessing there's newer technologies out there I'm not aware of.

Thanks!

 

[robinbanks]

Gonna take a long time to go over all that with a grout pen; have you considered a darker colour you could perhaps wash in?

 

[DiyNutJob]

It's 1" hexagon tile so it would be impossible to scrub all those lines.

If you start off defeated, then it's impossible. If you set your self a goal of scrubbing 1ft x 1ft per day, assuming scrubbing actually works. Before you know it, it's all done. Most grout renew involved digging out the surface layer and regrout.