Erikka Holderness, corrosion should usually clean oi\of with a vinegar/sterile water solution. Use a cotton swab pr 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 and left over water (depending on where the contacts are situated). Hope this helps, good luck.