Add 2 cups of distilled white vinegar (any vinegar will work) to a bowl.

Add 2 tbsp of salt to the vinegar and mix.

The salt lowers the pH of the vinegar, making it more acidic to dissolve rust more quickly.

Gloves are recommended to keep the vinegar solution off of your hands. Vinegar can ruin your guitar's finish, and the extra acidity may irritate sensitive skin.