It might be a good idea to lightly stage the home with plants, towels, etc, just to give more character to the place and separate you from the competition.

(treating them as a person, but im not doing it fake either)"Im doing good, how about you?""

Like the new Toyota Battery Plant, and UPS expansions.

Also, my wife is an agent, so I'm trying to "plant the seed" that I can help even if they want to list with an agent. 

Right after we left the house it was taken over by fake tenants who claim they  have rental Deal with a Realtor and current owner of the house (myself)Bank gave scammers 3-4 months to leave the house and Sheriff Dept was there and were thrown out!

If the tenant keeps a place nice, plants flowers, or does good maintenance I try to acknowledge that.

Isn't that a hotbed of a General Motors plant?  

Air Force Plant 42 in ... on Tuesday could mean thousands of new jobs coming to Southern California. ...

@Tom Kelly is correct - your biggest issue is humidity and spillage.In Colorado, a single person may grow up to 99 plants if they are a care giver and getting a care giver license is laughably easy.  

Also check if they have a dryer that it's properly venting outside.. and that she's not leaving wet clothes to air dry in the house...No house plants or fish tanks... as the extra moisture they need only adds to the problem