Sticky armrest or door handle after cleaning... Dust it with talcum powder.
 

I've had sticky armrests and door handles for years.
I just dusted them with talcum powder and they are no longer sticky.

also, do ever clean your armrests or handles or anything in your car with dollar store LA Totally awesome.

when I was younger,more flexible,and after the drive inn dates.I had that problem too.

really though,I use dish soap and a rag,to remove the human grease,and dirt that sticks to handles,wheels,and such.

If they are sticky they aren't clean yet. Try ammonia and Ivory Liquid dish soap in warm water. Get some gloves because this concoction will snatch the oil from your skin in a hurry. Easy on the ammonia, ok?

If you're shy about ammonia and soap try the GOJO white paste. Rub it on with a damp cloth and rinse it well.

EDIT: It was wrong of me to suggest or accuse you of not cleaning the armrest properly. Other conditions may cause vinyl to become sticky. SEM 39644 tac free will be a good remedy in cases where plasticizers are the issue. Pardon the quick response, please Sir.