There is a post in the forums called "how to harden your rentals" look it up there are about 700 replies with ideas.

There is some tape that can be purchased at Ace Hardware that is coated with a really strong hardening compound. 

there are a few great threads on BP about hardening rentals that touch on this

I️ recently heard about tenants pouring cement in the toilets and then flushing to have it harden in the pipes.

., can be an inexpensive, easy visual improvement for a dated home, even if you use the simplest, cheapest ones and buy in bulk.There are a few topics on here to search for about hardening your rentals -- a very good read before you begin.

On the maintenance side: a great deal depends on how good you are at locking a property down, hardening a rental, to start with.

Besides being potentially inhumane, someone has to either remove and "store" them daily or feed/water and remove feces/urine daily.Anchoring: some investors are using hardened steel bands and mounting them to the concrete basement floors. 

I like to renovate and rent, harden the properties for longevity and modernity. 

But don’t lose or harden your heart too much because of your experience.There are still people out there who sincerely need a break.Guys with open hearts just need to become more careful about who to trust.

Quote from @Nathan Harden: If you are looking for cash flow, then you can't go wrong with the midwest.