Cleaning to remove surface discoloration caused by dirt and grime is suitable for either sanded or non-sanded grout. Deep extraction cleaning utilizes heated water under pressure to physically separate dirt from the tile and grout surface. Deep extraction cleaning will have limited impact on stains. This is the most cost effective grout treatment. If your floor has been regularly sealed this may be all you need to restore your grout's appearance. Unfortunately, most people forget to re-seal their stone and grout. Unsealed grout can be stained with dirty mop water resulting in spotty stains and grayed out grout. While the industry standard, if your floor sees normal use and has not been sealed, this process will remove the surface dirt, but uncover hidden stains. While cost effective, the results are not always that beautiful clean fresh tile look you may be expecting (hoping for). The good news is that with each of the more advanced techniques, deep extraction cleaning is the first element. This is to insure all foreign particles or oils are removed from the surface prior to application of any other treatment. As such, one can always contract the cleaning and then decide to progress to a more involved treatment.