wind shield wash causes blade hop=-

[jamesmetairie]

is it my imagination or does some brands of windshield wash solution cause blade hop. same thing happened when i used the popular rain repellant. anyone else notice this problem?

[Moppie]

Its usualy a good sign you need new wiper blades.
They hop because the rubber has gone hard with age. If the window is really clean then the hard rubber sticks to the clean glass, but can't flex back and flow over it, so it hops.