We get this all the time up here in Montreal.
I just make sure that the motor is running with the defroster at max, and
use the scraper to work around them, without directly slashing at the
rubber. Eventually by scraping the ice along them, and sort of banking on
the support stem with my hand (not excessively hard), they will get freed
up. It is a good idea to look in to having the heavy duty winter type
wipers for your car. The summer ones are not very good, especially in the
winter time. The winter ones are very heavy duty, and are worth the extra
cost. They will also clean the snow off the windscreen while driving on the
highway during a snow storm.
Before using the wipers on any car during the winter, make sure that the
windscreen is clean from frozen snow and ice. This can put excessive
resistance on the wiper motor, wiper gearbox, and arm assemblies. If you are
lazy to clean the snow and ice off the windows manually before using the
wipers, you may shortly find yourself replacing a lot of parts.
Jerry Greenberg GLG Technologies GLG
Click to see the full signature.