The US Centers for Disease Control and Prevention has said that this year people are 2.3 times more like to wash their hands after sneezing or blowing their nose.
The FDA is warning that certain brands of hand sanitizer gels made in Mexico may be so toxic that, not only shouldn't you use them, you shouldn't even pour them down them drain. See the list of the 9 brands in question.
Keeping it in your car during hot weather, exposing it to the sun causing magnification of light through the bottle, and particularly being next to open flame while smoking in vehicles or grilling while enjoying this weekend can lead to disaster.