Well using the amazing Google machine...MaidEasyAZ.com is one.

That said, if you do get them and you choose a "fancy" front loader washing machine I would post some rules about leaving the washer door open, physically drying excess water off the door and drum, and any other instructions to prevent mildew because those units are evil and you will get mildew stains when your tenants leave, especially if they're used to normal washers.

Clayton Morris in 20 years when his co-workers stop cleaning the fry machine to talk about Memes.

I've had multiple kitchen fires completely covered by the Tenant, flooding due to a broken washing machine, flooding from a bathtub left running, and even an expensive bed bug issue.

In this case we also have a field manual that we wrote which has additional information on how to run the machine and for more usual cases.

If I go to the dump and find a sewing machine, do I all of a sudden have a tax-free clothing business because the sewing machine was abandoned and is not legally mine?

If you base your life on the news [read:propaganda machine,] you will forever be standing on the curb watching the cars go by. 

I plugged the question into the Google machine....apparently the answer is not a lot. 

Tenants will break things from time to time, they will clog common area toilets, they will break the washing machine, etc. etc.  

The only concern I have in his strategy is that I am afraid of building a machine and 10-30 years down the road I have this great income beginning to decline because properties are coming off the books.