Windshield Wiper/washer problems of the 2007 Hyundai Santa Fe

The washer fluid does not squirt onto the window. At best, the fluid sometimes dribbles out and hits the lowest part of the window, but only after holding the washer fluid button for up to 30 seconds. The dealership told me that the line was probably frozen and there was nothing they could do. They recommended I check the fluid line for blockage or heat it up with a hair dryer. I have the same problem on two different cars from the same manufacturer, and the problem exists in all types of weather. During light snow and rain, the window gets dirty and I have to pull off the road to clean the window in order to continue driving. I think that's a significant safety issue.