Scrape the ice? Nah! In my van I'll just start it up, clear the million bits of paper on top of the dash that block the vents that blow on the windscreen, turn the blowers on full (blowing towards the windscreen) and wait for it to warm up, then use the wipers to wipe the ice off the windscreen. All while I'm sitting down out of the cold listening to the radio. Works for me.
Peter
-- "The humble bic biro draws 13 beards, 9 devil moustaches and 49 penises on newspapers in its lifetime."