Visited a prospect at the end of last week - a small construction company with a textured ceramic floor, white on the high spots and a kind of artistic dark brown textured layer a bit lower. The office manager thought her current janitorial service was neglecting the floor, leaving a bit of dirt in the textured areas. I carry a small test kit in the trunk (I provide janitorial service in Phoenix AZ), so I brought in a bit of degreaser and a bit of an alkaline all-purpose cleaner, to see how much dirt I could easily remove. I squirted down a small puddle of each, let them set for a half minute (minimal dwell time, but I was in a hurry) and gave them a quick scrub with a stiff brush. Surprise! All the dark brown came off; the tile was supposed to be pure white after all. A quick scrub should take care of the rest.
Interesting what a dustmop followed by a string wet-mop will leave behind. Had the janitor been vacuuming rather than dustmopping, using a microfiber wet-mop rather than a string mop, and had any knowledge of janitorial supplies and equipment at all, he could have kept his client...
A bit about us:
My firm, CBN Building Maintenance, provides commercial cleaning services in Phoenix AZ and the wider metro area. We've been in business since 1974; hold the BBB's A-plus rating; and have long been in the forefront of the industry in environmentally sensitive cleaning for health, safety and security. Our program can generally improve Indoor Air Quality, in the size range of most allergens, by a factor of 50%, as reflected in our ongoing IAQ sampling.