Said It Here

How to clean heavy battery corrosion and acid buildup

Vehicle battery corrosion is caused by a chemical reaction between battery acid and the terminal metal, often exacerbated by moisture and age. This buildup creates a barrier that blocks electrical current, preventing the car from starting or properly charging.

Overview
People affected7 accounts across 4 forums
Workarounds found17 items attempted
Community agreement128 total upvotes

What the numbers show

Counted from the threads quoted below. How we count

  • People have been saying this in most months since July 2026.

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

17 items+ Contribute

Found another way around this?

Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.

  1. 1
    Clean with baking soda and water
    Did this help you?
  2. 2
    Use commercial battery cleaner and water
    Did this help you?
  3. 3
    Apply white lithium grease or corrosion inhibitor
    Did this help you?
  4. 4
    Use felt washers on battery posts
    Did this help you?
  5. 5
    clean the terminals and cable ends really well with a wire brush or some baking soda paste
    Did this help you?
  6. 6
    Using gloves, plastic scrapers or razor blades, and neutralizing the alkaline substance with vinegar, lemon juice, or water.
    Did this help you?
  7. 7
    Scrubbing the area with a baking soda and water solution
    Did this help you?
  8. 8
    Using acid neutralizer sprays or felt rings from an auto parts store
    Did this help you?
  9. 9
    Replacing the affected part (like the battery tray)
    Did this help you?
  10. 10
    Using baking soda mixed with water to neutralize the acid
    Did this help you?
  11. 11
    Wire brushing and painting the corroded area
    Did this help you?
  12. 12
    Replacing the battery repeatedly under warranty
    Did this help you?
  13. 13
    Cleaning off corrosion using a wire brush and a mixture of baking soda and water or terminal cleaner spray
    Did this help you?
  14. 14
    Applying anti-corrosion spray and installing battery terminal protectors
    Did this help you?
  15. 15
    Properly tightening the battery hold-down bracket to prevent loose movement and short circuits
    Did this help you?
  16. 16
    Reorienting terminal connectors away from metal bracket edges to ensure clearance
    Did this help you?
  17. 17
    Testing and replacing the alternator voltage regulator to stop overcharging and venting
    Did this help you?
Tried another approach not listed above?+ Share your workaround ↑

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.

r/autorepair2 people · July 2026

“Didn’t know where to post or what’s even going on with my battery.”source ↗

aphoticphoton · r/autorepair · 115 upvotes

“First time I used it I was like how tf did I get acid and corrosion everywhere?”source ↗

obiwanshinobi900 · r/autorepair · 3 upvotes
r/AskMechanics1 person · October 2026

“I think we are on our 5th battery warranty on these, they get super corroded and usually stop working in winter, can I clean this? What do I do?”source ↗

BigLuke-US · r/AskMechanics · 7 upvotes
r/CleaningTips1 person · September 2026

“How the heck do I clean this safely?”source ↗

Agitated-Bake-1231 · r/CleaningTips · 2 upvotes
r/MechanicAdvice3 people · September 2026

“My car half cranked then stopped cranking all together after i tried again.”source ↗

“Is this corrosion causing this?”source ↗

“I also replaced this battery in 2023 is it time ?”source ↗

Showmethemoney1293 · r/MechanicAdvice · 1 upvotes

“Is there a gel I can apply to the terminal to stop this from happening?”source ↗

dontfret71 · r/MechanicAdvice · 1 upvotes

“Am I able to clean it off somehow or do I need to replace the piece? I’m selling my car in a couple months to move to NYC and don’t want anything to bring the value down more.”source ↗

ahllura · r/MechanicAdvice · 1 upvotes

Where this came up

People with this problem also raised