Remove the battery from the device's compartment. Neutralize the acid by applying either white vinegar or lemon juice with a cotton swab.

Q: How can I remove a battery-acid stain from a concrete garage floor? It was caused by a golf cart. A: Because acids attack concrete, the affected area may be darker and altered in texture, and ...

The muriatic acid will absolutely remove the hard water deposits that are trapping the stains. The longer it soaks, the less you have to scrub.

Neutralize the acid by applying either white vinegar or lemon juice with a cotton swab. "You don't need to drench your device, just simply apply a few drops and wait for the corrosion to start to fizz ...