using scrubber on tile and grout

[jimjimracing]

anyone out there like to use a low speed scrubber instead a grout brush..?

after the scrub,, my brush looks like snow white. and the tile and grout looks like newly laid.

however the edges ... corner.....is a bit headache

another question is how to remove a stain on marble.. dog urine... or just walk away??

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[Davestone]

I would try a commercial product like urinegone,or urineaway, i can't remember the exact names, ammonia also works sometimes.