Why bother?
Our tractors our washed once a month, after one day in the city, why bother. A medical company no longer put's up with smoking in their units- they fire the driver- they have had plenty of notices about company policy.. The tractors are leased and they are not theirs to destroy. Simply put.
Previous places I worked when a driver was cancelled or had no run- they were offered the opportunity to fuel/oil etc, clean, detail the units and write up any issues noticed, and park them in the shop or ready line. When you entered a unit, they were all pretty much the same...clean, fueled, and road ready. When that driver was caught up, they would work the dock, hostle- or if any extra road or city work was available, they would be allowed to work. That would never happen here, it makes to much sense.
It used to be a courtesy to others to keep the units clean...Other than the DVIR, the next driver usually doesn't notice I drove their unit. Leave no footprints, take out the trash, leave it better than you found it. Most shops provide paper towels and window cleaner. Hell, you can get paper towels and cleaner for @ $2.00 at any dollar store. If you wouldn't do it in/to your personal vehicle, don't do it to the units here.
After the changes here, I don't expect this to happen at all, it will sadly become worse.