Most wiper blades should be replaced every 6-12 months for most vehicles in most locations.* This varies greatly depending on numerous factors as well as what your expectation of "acceptable performance" is. By looking at wiper replacement preventatively, conditioning is less necessary because you'll replace them before they get really bad.
That said:
1. Keep your windshield clean...the more you clean it, the better your wipers will perform and the longer they'll last.
2. This will sound funny - don't tailgate. When you tailgate, more dirt is kicked up onto the windshield.
3. Use any type of carsoap and water and rub along the lengths of the blades back and forth, removing dirt. You will hear others talk about using alcohol and I'm not a big fan of that. We're dealing with rubber here...
4. Use glass treatment. Treated glass helps keep dirt from sticking to the glass, which helps your wiper performance. I recommend Aquapel Glass Treatment which lasts 4-6 months for one treatment.
5. Store your vehicle inside and out of the sun as much as possible. The heat and ultraviolet rays break down the rubber and make it stiffen over time. The heat and sun are the number 1 causes of wiper degration.
Windshield wipers should be replaced every 6,000 miles. The windshield wipers should be any of the following sizes: 93-01, 94, 95, or 96.
A bad relay switch will cause the windshield wipers to not turn off. Replace the relay switch and the windshield wipers should turn off.
Windshield wipers don't work
A cars windshield wipers should work either way. They should word with or without wiper fluid.
Why are there windshield wipers inside the car?
Replace the windshield wipers.
The 2002 Chevrolet trailblazer windshield wiper motor should be replaced, when the windshield wipers are skipping. The windshield wiper motor can be located in the engine compartment.
If your windshield wipers are not working, you should check your owners manual. It could be a fuse or another easy fix.
Mary Anderson invented windshield wipers in 1903.
When purchasing windshield wipers that work intermittently, they can be any windshield wipers that are the correct size. The ability to work intermittently is a wiring/fuse ordeal. This does not play a part in the selection of windshield wipers that you choose from.
The windshield wipers go back in forth if you now now what i mean
Should be 20"