Have they looked at their stock of rental shoes? If there's shmutz on the bottom of the rental shoes, it could be tracked onto the approaches. Also, how about their carpets / floors in the concourse area? If those are dirty or have been cleaned with something that leaves residue, then that could also get tracked on the approaches.
I notice at most centers when they're spraying the shoes at the end of the night, they rarely check the soles to see if there is anything on them. I would think brushing the soles would be a wise step in the shoe maintenance process. He could clean the approaches 'til the cows come home, but have them dirty and sticky again almost instantly if something from the carpets or rental shoes is being tracked onto the approaches first thing in the morning.
Just some ideas... Hope he finds the solution. Some old folks' knees will be happy if he does.
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