When working with batteries, you must always remove the negative lead from the battery first, even if the corrosion is only on the positive lead.
Using a 10mm hex wrench, loosen the nut on the screw holding the negative terminal in place.
If the corrosion is preventing you from accessing the nut, use the other (open) end of the wrench or a wire brush to scrape some of the corrosion away.
Pull the negative battery cable off of the negative lead.
For this guide, we only show the removal and cleaning of the negative terminal. If you are going to clean the positive terminal, first remove the negative terminal and then remove the positive terminal. The process for removing both leads is the same; it is only the order that is important.
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