It is typically caused by excess humidity (showering or cooking) and can be resolved by teaching the tenant to use ventilation fans and airing out the home once a week for 10-15 minutes.

.$178  -  TCL 43” Class Q5 4K UHD  Roku TV - https://www.walmart.com/ip/43-HDR-QLED/7655563299$5.00  -  Sertapedic Dreamloft Bed Pillow, Standard Size (20"x26") - https://www.walmart.com/ip/seort/5493381861$228  -  TCL 65” Class S4 4K UHD HDR LED Roku TV - https://www.walmart.com/ip/seort/5830084914$50  -  Gourmia 6-Slice Digital Toaster Oven Air Fryer - https://www.walmart.com/ip/GOURMIA-6SL-TO-W-PRO/5650052853$178  - Hisense 55" Class R6 Series 4K UHD Roku TV - https://www.walmart.com/ip/The-Hisense-Roku-TV-R6-Series-pac...$50  - Gourmia All-in-One 14-Quart Air Fryer - https://www.walmart.com/ip/GOURMIA-14QT-AIR-FRY/5466948866$25  - Crock-Pot 7 Quart Oval Manual Slow Cooker - https://www.amazon.com/gp/product/B003OAJGJOOk, so as you can see, the algorithm grabbed up a bunch of Walmart deals this time around.

I would also strongly recommend mounting outdoor Air Condensers higher up.

You can use a market rent 1007, Air DNA, to qualify.

How do you replace the air filters?

Baseboards, couch cushions, above fridge, in cabinets, grout/caulk lines, rug maintenance, air filters, windows inside and out, dust the top corners of windows, corners of high places etc etc.  

As well as benefitting from cash rewards and or air miles on credit cards.Thanks for the discussion! 

I'm an active duty Air Force (retiring soon).

Raising capital, appearing on podcasts, creating misleading social media content &  finding deals are now used as tools to create credentials out of thin air.

:) )4) Do you heat/ air condition the common area?