Costs to cure.

If they don't maintenance the lawn, send notification to cure just like any lease violation (and get it taken care of and bill back to resident).

You can also send him a notice to cure the unauthorized occupants and renter's insurance.

You can serve a "notice to cure" which gives the tenant a specific timeframe (usually 14 days) to fix the violation (in this case, not properly maintaining cleanliness or disrupting the peace).

The pre-foreclosure status is to be cured before the end of escrow, whenever it happens.

A good agent might actually know some minor ways how to cure title issues though the title attorney will as well. 

Having a trusted real estate investor friendly agent would cure a lot of these worries.

Rest is the only cure, and even that is uncertain.

If your lease prohibits unauthorized occupants, and they violated that provision, that is (in the state of Florida) a curable violation, which requires a 7 day notice to cure.

They are as-is, no viewings, and not cured of all liens.