1. Penetrating Oil: This is the *most crucial* step. Liberally apply a penetrating oil (like PB Blaster, Liquid Wrench, or Kroil) to the area where the wiper arm connects to the wiper shaft. Let it soak for at least 15-30 minutes, or even longer if possible (overnight is best). The penetrating oil will help break down rust and corrosion, allowing the arm to move more freely. Reapply the oil several times during the soaking period.
2. Gentle Persuasion: After the oil has soaked in, try gently wiggling the wiper arm back and forth. Use a firm but controlled motion, avoiding any sudden jerks or excessive force. You might need to use some leverage, but avoid using anything that could damage the wiper arm or the shaft.
3. The "Puller" Method (If necessary): If wiggling doesn't work, you can use a wiper arm puller. These tools are relatively inexpensive and are specifically designed for this purpose. They clamp onto the wiper arm and provide a controlled way to pull it off without risking damage. This is the preferred method if the arm is truly stuck. You can find these at most auto parts stores.
4. Impact Method (Use with Extreme Caution): As a last resort, and only if you're comfortable and skilled with tools, you could try a small, controlled tap with a rubber mallet on the back of the wiper arm. *Only do this after generously applying penetrating oil and attempting the other methods*. A forceful blow could easily damage the wiper arm or the shaft.
Important Considerations:
* Wiper Arm Position: Make sure the wiper arm is in the resting position (usually pointing downward). This is often the easiest position to remove it.
* Shaft Damage: If the shaft is severely corroded or damaged, you might need to replace the entire wiper transmission assembly. Examine the shaft carefully after removing the arm to check for damage.
* Safety: Wear safety glasses to protect your eyes from flying debris.
If you've tried all of these methods and the wiper arm still won't budge, it's best to seek professional help from a mechanic. Forcing it off could result in significant damage to your vehicle's wiper system, which is far more costly to repair.
