The people in this thread are either misunderstanding you (thinking you have a big 8" slab of snow on your roof) or are unfamiliar with regularly snowy places, or are completely unhinged. That, or I misunderstand and you are talking about driving with inches of snow on your roof, in which case, yeah brush off what you can before driving.

But I get it, especially when it gets a bit warmer and the snow kinda melts a bit and gets icy and sticks.

The hot water will melt the snow and ice, don’t worry. The car wash deals with ice chunks from wheel wells all the time. Its just more water and road grime.