When I few for Tasair we had a hot water tap with a hose at Devonport, got the ice off quick during the pre-flight although it would built up again quickly if you were delayed and the sun didn’t get on the aeroplane before departure.
Great fun flying an ice block around tassie in the middle of winter..... It’s amazing how much ice a Chieftain can carry, coupled without being able to see out the front windscreen due to the rim ice.