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Prices may varyHealth score is for adult use as intended, per the manufacturer's SDS. It does not model child ingestion, accidental spill cleanup, or off-label use. See the safety panel below for full hazard classification, and /disclaimer for the full editorial scope.
No Safety Data Sheet on file.
CarCareTruth has not received a Safety Data Sheet from the manufacturer for this product. Hazard classification and PPE cannot be cited. Request an SDS from the manufacturer before use.
The Podium · Top 3 in Battery Terminal Cleaner
See the full ranking →This product ranks #6 of 6 in Battery Terminal Cleaner.Three above it ↓
CarCareTruth's Analysis
Last reviewed May 26, 2026
TL;DR Five Amazon reviews (4.6 stars) are too few to confirm whether this aerosol clears significant corrosion buildup without a wire brush — the question that matters most in this category. The listing claims acid-neutralizing chemistry, but no SDS is available and health data is withheld at 3.0.
What it is and how it performs
BTC4 is a pressurized aerosol that dissolves white-blue corrosion on terminal posts and cable clamps and neutralizes residual acid. Spray on, let it react, then rinse or wipe. Whether it handles heavy crusty buildup in a single application is unknown — no forum or community evidence exists. BTC4 is discontinued and no longer in Gunk's active lineup; the Amazon listing shows currently unavailable.
Who should buy this — and who should skip it
A reasonable option for light routine terminal maintenance if you can source it — the acid-neutralization claim is plausible. Skip it for heavy buildup from a long-neglected battery; that requires confirmed single-application efficacy this product can't demonstrate at N=5. Also skip if you need an active SDS — none exists for BTC4.
Safety and environmental impact
No SDS is available, so no hazard classifications can be confirmed. PPE tiers reflect the aerosol delivery scenario only — wear safety glasses when spraying near face level. Rinse water is drain-destined; dispose of waste water away from storm drains.
The corrosion dissolved from battery terminals contains lead sulfate — wash hands thoroughly after handling the cleaned terminals, and avoid rinsing dissolved corrosion into storm drains.
Frequently asked questions
How does Gunk BTC4 Battery Terminal Cleaner score on CarCareTruth?▾
CarCareTruth scores Gunk BTC4 Battery Terminal Cleaner at 5.4 out of 10 on the composite CCT score, with a health sub-score of 3.0/10. The CCT score blends real-world effectiveness, ingredient health impact pulled from the manufacturer's safety sheet, and environmental footprint against a published category rubric. See the methodology link on this page for the full scoring breakdown.
What's in Gunk BTC4 Battery Terminal Cleaner?▾
Per the Safety Data Sheet ingredient disclosure: SDS not available. Formula unknown. No ingredient information on product listing or brand website for this discontinued product.
From the manufacturer
Marketing copy from Gunk, via Amazon. Not editorial.
- •Neutralizes battery acid corrosion
- •Cleans dirt and grease
- •Prolongs battery life
- •Convenient aerosol container
- •This item is not for sale in Catalina Island
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Manufacturer specifications
- Brand
- Gunk
- Item Form
- Spray
- Item Volume
- 5 Fluid Ounces
- Unit Count
- 5.0 Ounce
- Number of Items
- 1
- Contains Liquid Contents?
- Yes
- Brand Name
- Gunk
- Global Trade Identification Number
- 00078698107905
- Manufacturer
- Gunk
- UPC
- 078698107905
- Model Number
- BTC4
- Part Number
- BTC4
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Top Amazon review
↗External — Amazon's most-helpful review for context.
Works as advertised.
The cleaner is soda based and neutralizes the battery acid. Be careful where you spray it since it can kill the battery. The cleaning solution washes of with water.