I’ve never used them but you can certainly try “the guarantors” who promise to pay unpaid rent and any damage in excess of damage deposit.

I've been using second nature for a while but it's been terrible. have a lot of problems with getting damaged air filters

But, without a buyer even if you “won” in court how would you establish monetary damages? 

That said, since the borrower’s debt was wiped out in the Chapter 7, the damage is often limited because the worst of it, the bankruptcy, already did most of the harm.

Go read the short book, "Who Moved My Cheese".You're holding onto your past plans and NOT adapting to the present.Either cut the price 5% every 2 weeks until it sells, even at a loss, or do soemthing else with it.Suggestion: be careful about refinancing and converting to LTR as tenants are likely to damage your flip work.

I know the grout may be something I would need to service on a yearly basis to avoid damage to the sheetrock walls or should I stick to surround panels.Please feel free to share your thoughts and experiences.

This would typically still cover any damages to the house itself, and any liability for owning the property, but would no longer cover the contents of the house, which is a fairly large line item within your owner-occupant coverage. 

. - Second tenant was hard on the house, but no real major damage.- Third tenant was another great one.- Fourth & last tenant lived like a pig and caused a LOT of damage.

With a security deposit and walkthrough documentation, I would think you could cover a lot of your expenses to fix the damage

Then you deduct any expenses for damages from that.