when im calling someone why do they say I sound fuzzy

basically my mic got wet a while back and since then everyone says i sound fuzzy i cant afford a new ipod or to fix mine how can i fix it for free???

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0