..... after seeing this report - https://www.cbc.ca/marketplace/episodes/2018-2019/filthy-flights-what-are-the-dirtiest-airplane-surfaces .
I'm not sure if everyone will be able to watch it, but the main point is that aircraft are not properly cleaned between flights, and there are a lot of very filthy surfaces containing E-Coli (fecal matter), etc. The tray table or seat pocket are not the worst offenders, which is surprising considering some of the things that flight attendants have found in them (I won't elaborate). That distinction goes to the headrest.
OK, I'll probably fly again but I'm going to take a large package of disinfectant Handi-Wipes and be more diligent about cleaning than I've been in the past.