I cleaned mine ok with lots of tedious caution and a little flash light, but am hesitant to recommend it as a DIY service to others since it was harder than I imagined and since I believe many AC companies will come do an annual service with coil cleaning for around $150 (again, just guesstimate) and likely have a method more foolproof than my aerosol cleaner can and garden hose, plus they can look the system over and catch/fix any small issues before a home inspector would find them. 

Changing your mind " Is a foolproof legal defense .

Even this isn’t foolproof but it helps.

Doubling up on deposits or requiring larger deposits might weed out some of the riskier tenants upfront, though it's not always a foolproof solution, especially in markets where affordable housing is tight.Regarding your point about double security deposits, you're absolutely right-this can be an effective strategy.

We have a few good ones here and while it's not foolproof, they do a decent job and you only pay if they collect (they keep a portion).

Good communication makes everything easier but not foolproof.

TT helps, but I always end up making a lot of adjustments and corrections as TT is far from fool-proof when you have rentals and private placement securities (syndications).

And while nothing is foolproof the most consistent method of finding good vendors is relying on OTHER real estate investors that have worked with those vendors. 

Originally posted by @Kevin Sobilo:@Frank Chin, many problems don't have one simple foolproof solution, but if you label cans with black paint or marker, it should remain readable.

However, before that, we relied solely on Rent Screening, which provided an exceptional service with no issues to report.It's noteworthy to mention that there are several new entrants in the market claiming to offer foolproof tenant screening, simpler income verification, document validation, and bank verification - FinDigs being one of them.