when your arm pit is stinky rub micellar water on it and boom it's fresh again
if you don't want you cupholders in your car to get dirty just put cups in them to put your cups in.
I also use one cup holder for my glass cup which I fill with change
so that way I can just move the glass cup when I need to, take a cardboard cup from the stack I have in the front, put it in the spot, then put my cup in that cardboard cup.
so you literally never have dirty gross change, or dirty gross cup holders.
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I also keep a zip plastic (durable long lasting, not like a flimsy breakable ziplock bag) to put the extra change into when it stacks up too high or whatever. you never know when you need extra change so I keep it in the car