Freezing rain is basically rain, but then it freezes. It creates an ice layer on top of everything. Sometimes it will get mixed in with snow so it makes more of an ice crust. Really nasty stuff as it's usually permanent for the rest of the season. You can't really take that stuff off of anything without using a large amount of heat or force that would damage whatever you're taking it off of. For the car, that means running it for an hour or so to at least get the worst of it off.
My solar panels have been out of commission since around December as we got some around that time. Well they still produce, but only enough to trickle charge the battery.
When I was a kid I remember after freezing rain it was kind of fun to walk right on top of the snow as it had a thick ice layer that was strong enough to support my weight without sinking in. Could cut out chunks and use it as fort building material.