Is 70% isopropyl alcohol on skin dangerous - if using as a sanitizer since the stores are out? we use it after touching shopping carts or being in stores where we touch thing. a small spray on palms. also spray the steering wheel after the mechanic?

No: not dangerous, but may tend to dry skin somewhat.

Sanitizer: The pocket hands sanitizer sprays are usually mostly isopropyl alcohol; at 70% efficacy is very good. Spraying your hands after touching "high touch" surfaces is a good idea, think shopping carts, nonautomatic doors, gas station pumps. It could be harmful if sprayed towards eyes, nose, mouth.