I have had very good success using wd-40s "specialist" silicone lubricant. Id highly recommend it.
It's my go to for most light duty lubricating needs and door tracks in places like that. It sprays on but dries to a film that doesn't attract dirt and make a mess, and is effective. I use it for rollers on switches, restrictors, wire ropes on roped hydros (no traction concerns), lots of moving parts. It lasts a long time and doesn't get sticky as it gets old.
Check out all of wd-40s specialist line. They make a dry lubricant that sprays on, chain lube, contact cleaner, and others. And once you use that flip up straw you won't want to go back. The only thing they don't make with that straw I wish they did is brake cleaner.
I feel you though, we used to take care of a few cars in a flour place like that. Be careful on the cartop, that stuffs real slippery. Used to have to blow ourselves and tools off with an air compressor hose before leaving. I wouldn't take a call there in the morning, would only go as my last job for the day.