Tip: Murphys Oil Soap might Clean that paneling like new.

Move to an electronic card system even for the soap dispensers. 

We also provide a welcome basket that gives them items to get through a few days so they don't have to go shopping right when they arrive (2 toilet paper rolls, 1 paper towel roll, small dish soap, small hand soap, 2 dishwasher pods, 2 laundry pods, 3 garbage bags, scrub brush for dishes, a few coffee pods, some sugar packets, etc).

The food can be dust, soap scum, etc.Use a bleach solution or a special mold cleaner to remove the mold.

Sorry for my Saturday night soap box; I'm not sure if it answered your question.  

Someone took the little basket that holds soap and shampoo and the sign on the back of the toilet and placed them waaay in the back of the bathroom cabinet.Someone removed the tiny little LED lights I have on this 8 foot tall fake ficus in the kids bunk room and put in on the deck.

If you're worried about hurting your friend's feelings, offer to have him refer you out to another agent and he'll get 25% of that commission.Anyway, enough of my pessimistic soap box. 

I do have a warehouse and tend to over supply some things I know will need eventually, like TP paper towels, kleenex, shampoo, laundry soap, etc.

Have soap and towel, face masks , you dont know how the tenant lives . 

In my STRs, I have a little store at one property with eggs, honey, soaps, etc and that has done extremely well.