Spray for weeds: 100 (maybe??).

I agreed when they renewed the lease I would be willing to spray for roaches if they would clean their house top to bottom.

I’ve had so many plumbing leaks like this over the years, I’ve found it saves a ton of money to just deal with it myself: fix leak, pull everything out, use an air handler, big old dehumidifier, fans to dry it all out, wipe off the mold, spray some bleach, replace drywall, put it all back together and I can usually get it done relatively quickly for a couple grand and move on without having to mess with getting completely gouged by sketchy restoration companies or insurance (who just raise your rates or drop you).

Buying as REO is more difficult, banks want to spray paint them and sell for higher $$.

Now if you had installed a $30 drain pipe from the pressure valve leading to a sump pump or other such drain it would have drained away without the spray/misting/soaking damages you experienced until you discovered it.

All the national franchises do - it's not like spraying for ants. 

Rather than replace that ugly stove top or fridge, maybe a couple coats of appliance epoxy spray can do the trick.

A few months after buying my 4-unit I had one tenant who told me they had bed bugs and although they were proactive (they used the powder and mattress covers) I bought them some spray on Amazon that had good ratings (it was non-toxic as well).I also sprayed the outside hallway, stairs and both vacant upstairs units with a bug killer I bought at Lowe's that supposedly kills bedbugs and other bugs for up to a year. 

We build them using some methods from passive housing standards like preventing thermal bridging and spray foam insulation to the best we can create an airtight envelope.

I get out and spray some weeds and walk each property 1x a month (when there is no snow.).