I leave a package of soap in each dish in the bathroom tubs and sinks (or if there are soap dispensers make sure these are filled) and leave a small bottle of dish washing liquid by kitchen sink/small box of those dishwasher pellets in rental properties with dishwashers.

It would take a LOT of candles to do that though.Mild dish soap and water should remove it.

We had one place with horribly uncomfortable furniture, empty bottles of soap/shampoo, uselessly thin toilet paper, and a million inane house rules.

Some you can barely put a container of soap on they're so small!

Sorry, if you already said what the building was comprised of - I'm too lazy to go back and look.

To better help you understand my audience, my tenants are comprised of college students, strippers, ski bums, and kids burning through their trust funds.  

OK off soap box  LOL 

I reglazed a rental about 8 years ago and it's held up decently, but the soap dishes are back to pink (yes, it was pink!) 

Just get the wash cloth and soap wet. 

Leave instructions on how it is used (ie no dish soap) and a small box of dishwasher detergent or some dishwasher pods, so they can see what to use.