@nicd I rent a space that has panels all over the building. As long as they aren't beaten to death, it's fine to use a soft brush to get the excess snow off them. You don't have to get it all off, the panels heat up as they work and the rest just melts. A 1-2cm coverage is something you might as well just ignore, that'll melt during the next sunny day. But a 20cm overnight coverage will be something that needs a little help with a brush.
