I carry cleaning antibacterial wipes everywhere I go. I use them on flights. I clean everything thoroughly especially tray table, seat belt, hand rests and anything else I can possibly clean. Then I do it again. When I first started this a few years back I would get some looks. However, no one looks now and in fact asked me if I can give them a wipe. Of course I carry two or three packs as other places like restaurants. Hand sanitizer is very useful for different situations. Don't count on any airline to clean as well as you can. Also if you are flying and have a tv in the back of the seat to look at movies clean the cord to the remote, the remote itself and the screen.
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