Has anybody ever tried get rid of snow on multispan polytunnels using loads of rock salt? When the snow builds up in the gutters, as it is now, there is no way of getting rid of it off a long polytunnel. Don’t want to loose this one like in 2010. If not rock salt, maybe making a saline solution and spraying it through intermitant small holes made in the polythene from below. This would save walking along the gutter and chucking salt around in 40mph winds.