Tile and grout, 1st time

[Ron Werner]

Cleaned some kitchen T&G, didn't get pics unfortunately.
The tile wasn't the problem, it was the grout. I used Attack and O2, mixed strong, used a grout brush to scrub but they were still quite black or partially black.
Is this just a case of grout that needs to be colour sealed or is there a product that would clean them?

 

[Mikey P]

and what tool did you rinse with?

 

[Ron Werner]

used the Spinner at 1000psi

 

[TimP]

After that you got to use acid Ron. Acid is for grout restoration. But not to be used if the actual tile bubbles when exposed to the acid.

 

[Ron Werner]

thanks

 

[RickL]

I'd bet there is something on the floor that impregnated into the grout, wax, mop and glow, etc. Acid won't help much. Strippers Barebones,Johnson Fastrip etc and even then you have to set expectations that it's going to be spotty.
I run in to this all the time at commercial accounts that have a maint crew that does VCT they wax everything.

 

[TimP]

I'd bet there is something on the floor that impregnated into the grout, wax, mop and glow, etc. Acid won't help much. Strippers Barebones,Johnson Fastrip etc and even then you have to set expectations that it's going to be spotty.
I run in to this all the time at commercial accounts that have a maint crew that does VCT they wax everything.

The way you'd know if this was true if acid doesn't bubble on the grout.

 

[tim]

Next time use floor stripper. Test the grout with a little stripper and acid in 2 bad areas. See which one attacks the soil best. If neither do, color seal