Years back in the early 80's,I did a little research on this subject because I noticed how a few manufacturers (mostly copy-cats, btw) jumping on the band wagon seeing an opportunity to sell some "special equipment". They all stated that:
"YOU NEED; 1200 PSI"...."YOU NEED; to blast that dirt off......"YOU NEED; a revolving floor wand....."YOU NEED.....on and on!
Well the 5 professional companies I contacted (3--Mexican companies/ 2---Italian companies) all specialized in tile and stone installations and cleaning. All of them advised to use a good cleaning agent. Allow to dwell. Then, engage mechanical action (rotary)to break up soil and grease. Then, using a floor wand with jets attached to a Extractor, use a "light rinse" (100 psi) to flush and dry the hard floor.
Using higher pressures could potentially do the following as they had experienced: 1. Dislodge grout which has lost its integrity, 2. water could be forced down and under the tiles, then pop them later after the job. 3. Hard to match some grout colors especially after it has aged. 4. Streaking especially if tile had been sealed.
Just something to think about before the unsuspecting purchasers fall for certain "Sugar-Coating" that some of these sales company's offer as a great opportunity. Make sure its not an Opportunity for a law suit!
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