CarCareTruth Score
Decent.
Saved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
As an Amazon Associate I earn from qualifying purchases. Full disclosure
Health 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.
Last reviewed June 14, 2026
TL;DR The community track record is still far too thin 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 5.0.
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 product listing shows currently unavailable.
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. Also skip if you need an active SDS · none exists for BTC4.
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.
CarCareTruth scores Gunk BTC4 Battery Terminal Cleaner at 5.8 out of 10 on the composite CCT score, with a health sub-score of 5.0/10. 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.
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.
Marketing copy from Gunk, via Amazon. Not editorial.
Weekly pick
One product, one safety verdict, every week. No spam.
NOCO
E404 Battery Terminal Cleaner and Acid Detector
CRC
Battery Cleaner with Acid Indicator (11 oz)
NOCO
NCP2 M401 Battery Terminal Cleaning Kit
NOCO
Remove E403S Battery Terminal Cleaner Spray
As an Amazon Associate I earn from qualifying purchases. Full disclosure
Community
0 postsShare how you use this product
Drop a quick comment or post a full review with photos and a star rating.
Sign in to postNew here? Create a free account.