Like is used to clean the driveway with when there's an oil spill. 

You know the answer.Just be a good landlord - provide a nice, clean and safe place for people to live and charge accordingly.

How can you prevent them from DIY?

Many DIY landlord use their own names & addresses.

Clean facility easy and hard, value add steps. 

Clean the place up and move on.It's highly unlikely he would ever come back to you when he has child p*rn charges on his record.

In response we did a deep clean on the unit and couldn't find any bed bugs but found some possible bug casing and bug excrement.

You will have much higher cleaning/maintenance costs, higher turnover, unpaid rent, evictions, etc.

Personally not a fan of out of state BRRRR.I think it's a recipe for disaster and having been in the game for 10+ years, I've seen the disaster first hand as I bought hundreds of deals from disgruntled out of state investors who thought they can do it themselves.My property management company has doubled in 12 months also due to out of state investors getting caught with a poor property manager when trying to do it themselves from afar so they come to us for help 🤷‍♂️I'm seeing many investors buying D class crap on the MLS for too much and that needs work.They end up being into the property for 30% more than they would be that if they just bought turnkey.A true turnkey provider will find the cheapest/best deals through a variety of acquisition methods, renovate well and sell for fair market value (And manage in-house).If things go South, they are solely to blame and the penny drops with them.But with DIY, who is to blame?

Purchase price: $279,000 Cash invested: $45,000 Sale price: $425,000 Off-market property I found, contacted the sellers and proposed a cash offer of $279K "as is" (suggesting we would clean out the entire property & dispose of whatever the sellers didn't want.).