I don�t drive other people�s personal cars.
As you renting a car. It is something I do when traveling on business and I check to see that the car had been thoroughly cleaned and specify that it have vinyl or leather seats (not cloth).
This occurs a few times a year at most.
I can�t totally avoid contact with others furniture etc. such as a meeting in another attorney�s conference room.
But that casual contact is different than bring the used item into my home or regular use such as a car.