Lets face it, is it really worth all the fuss fooling with probably old
worn-old wiper blades? Seriously, winter wiper blades are only $10-$12
each, at the most (unless you buy the more expensive Teflon coated ones) and
if you switch them in the spring with an all season blade, you'll probably
get many years of service out of one set. I keep two sets of blades for my
vehicles, all season and winter blades, which I usually change at the same
time I switch my tires. Do you know how old the set on your car is now?
Are they winter or summer blades (there is a difference, winter blades are
wrapped in rubber usually)?
Like someone else suggested, try bending the wiper arm as it may have lost
its spring over the years, helping to hold the blade firmly against the
glass. Something else you can try is to take an old rag and some rubbing
alcohol and clean both sides of the rubber edge on the blade. The rubber
tends to dry out and crack, thus giving you smears on the windshield, the
alcohol should help to keep it soft and moist. If all else fails, throw
these ones out and pick up another pair.
You changed your summer tires to snow tires to help keep the car on the
road, now change the wiper blades so you can see where that road is.