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Good point! You took the words right out of my mouth, and I couldn’t agree with your assessment any more.
It sounds like your grout wasn't sealed (or the sealer has worn off) and the dirt/stains are embedded. People sometimes don't realize grout has to be resealed periodically or it will get like that.
Anyway, I found this on one site "The only way we used to clean grout was to use bleach, which at best cleans mold and mildew. It lightens the grout stains, but the effect is only temporary. It is just a surface clean.
The best way to clean out grout that is already filled with dirt and gunk is to use a steam extraction method. This is steam cleaning with hot steam, detergents, water pressure and vacuum extraction. Steam extraction machines dislodge the dirt packed in the tiny grout holes and lifts them out once and for all"
the other suggestion I saw was to mix up some Oxiclean and see if it will work which made me wonder if other enzyme cleaners like Folex would work (since they are easier to use than Oxiclean because they are like water and don't require and mixing).
Hi Velloci;I have a McCullogh hand held steamer that works really good...I spray the grout with Fantastic let it set awhile then spray with the steamer.
The steamer is a good investment as it can be used for alot of small jobs around the house,they cost about $60.00:)