How To Clean Battery Corrosion. If you dont have a spray bottle you can also wipe everything down with a damp rag. Gently rub the piece of cloth on the battery compartments including the terminals.
Vinegar is a weak acid that will dissolve and loosen corrosion. Then use another rag to dry the terminals completely. Fill up a spray bottle with a bit of water and spray down the terminals.
Do this with the cotton swabs or toothbrush dipped in vinegar or lemon juice.
Try not to saturate the area with excess liquid and use a little bit at a time to prevent getting liquid into the wiring inside. Carefully remove the batteries with gloved hands and recycle properly. Once the baking soda is applied you will see it bubble and foam as it reacts with the corrosion. Dip a cotton swab into white vinegar.