A. First of all, I would recommend a thorough dust mopping of the dry floor with a treated head. You want to remove all the grit you possibly can from the floor so the autoscrubber pad does not grind it into the finish. A properly treated head provides mild agitation and an almost magnetic attraction to soils without leaving oily residues. If the sand is still wet from melted snow, use a wet vac to remove it and get the floor dry.
Next, I would place a clean door mat in front of the maintenance room door so the autoscrubber wheels are cleaned on their way to do the job. I would also increase the inspection and cleaning frequency of the floor pads. Pads with grit in them will quickly damage the finish and make more work for you.
Finally, I would increase the cleaning detergency and frequency by at least 20% to confront a heavier soil load that is encountered during inclement weather.
You should also make certain that adequate length walk-off matting is in place and that it is cleaned or changed often enough to prevent major sand migration onto the finished floors.
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