Oooops, sorry Mike, didn't mean to stain that tie ole buddy, but you're miss'n someth'n, need to check in your state for the minimum loan amount that can be secured by real estate, can't just be go'n out there filing liens for any little ole bit ya want to, not only would it not hold that bucket of spit, you'd have your'self an other false lien matter to go see the judge 'bout!.

He needs at least $10,000 for his "equity" (his own stubborn sticking point).

I still need to play with the camera settings and go back for more photos, but, you can see below a reminder of why we have a No Pet policy:This is what many years of "doggie diapers" at the end of the hallway look like ... yes, the yellowish and brown areas are urine stains.  

For the attic I am looking a at the sheathing underneath if there is insulation I am looking and feeling for damp or water stains.

Not limited to- -heavily stained carpet-holes in the wall due to large nails, improperly hung items, poor drilling, etc.

Tile, wood-look waterproof vinyl planks, stain concrete, etc. will be your best friends.

I believe I cleaned all living spaces as well as one could, minus normal wear (nail/tack holes in walls, nicks, light staining etc).- I cleaned kitchen and bathroom NOT QUITE AS THOROUGHLY AS I WOULD'VE LIKED.

I would decline to do any cleaning  Yes, the tenant may have stained the carpet already and is preemptively trying to get out of a future damage charge.

Could you put in a neat white/Black/stained trim “frame” around it like built in art?

They can also purchase a humidifier, open the windows, or take other steps to prevent growth.The mold will cause staining, if it hasn't already.