As the weather warms up and hand sanitizer being even more common to carry around during this time, the Western Lakes Fire Department in Wisconsin has let people aware to NOT leave your hand sanitizer in the car.
Most hand sanitizers are alcohol based and can be flammable if exposed to the sun or an open flame. Hand sanitizer should not be left in a vehicle unless its being transported.
Personally, I have always had a bottle of of hand sanitizer in my car, especially during the outbreak. (see photo above) It looks like any more will stick just to my backpack.
Check out the link below for the story and more information.