Erikka Holderness, corrosion should usually clean of with a vinegar/sterile water solution. Use a cotton swab or soft toothbrush to clean the contacts. Rinse with sterile water after that, you may have to repeat this step a couple of times. Once it is properly cleaned, use 90%+ isopropyl alcohol to displace any left over water (depending on where the contacts are situated). Hope this helps, good luck.