Gassing it isn't always great since if it's snow, it'd cause the surface area to flatten and cause less friction. I did this once and slid backwards and hit the curb. A neighbor who helped me off the curb said it's best to go slow and turn your wheel in a wide zigzap pattern heading upward. Which did help me get up the hill.

As for if it's all ice and no friction at all, I think you can try cat litter on the surface. But if you have none, if you do have rock salt, I'd try that too but that's a lot of surface for you to cover.