Don't know if you do auto, approx cost to remove crud from battery?

use a soaking of vinegar and a little steel wool. then neutralize the vinegar with baking soda.

Just pour a can of coca cola on it.

Use coke. Just pour it on, let it soak and scrub it off with a toothbrush or a battery terminal brush. The acids in the coke will eat through the corrosion

Get a wire brush or steel wool and scrub it off.

Why pay someone to do it when it's so easy to do it yourself. This is a DIY site.

When it comes to cleaning the car battery, you have a choice of two cleaning agents. The most common one is baking soda. Here, you will mix two tablespoons of baking soda with an equal amount of water in a clean container. Stir the solution to form a paste, then use a toothbrush to apply the paste to each terminal. The solution will begin to sizzle as it interacts with the corrosion. Use a wire brush to remove the remaining residue. Alternately, you can use a cola product to clean the terminal. Simply obtain one new, 12-ounce can. Then, evenly pour the entire contents directly on the battery terminals to get the job done. The advantage here is that you don’t need to make a paste. Just follow up with the wire brush, if necessary.

One thing to consider is if the corrosion forms back quickly it may be time to replace the battery.

$1. Buy a coca-cola and get an old used tooth brush... it'll take the crud off a battery.