Hi Klinger,
Its 250 sq yards of Linen (or maybe Viscose/Rayon) carpet on a superyacht. Joe H knows about this as it has appeared on another forum - after some delays (boats don't run like buses) its this Friday and Saturday. The yacht will be moored mid-river so a method using something other than HWE seemed to be the choice. Its a safe method of cleaning this type of floor covering but you def can't use the original brushes once they've been used for agitating pre-spray as they are filthy! (The carpets cream by the way) extra set of brushes are surprisingly cheap.