Low beams not working 1994 Honda Civic EX
 

My low beam headlights aren't working on my '94 Civic EX. My high beams however, still work. I changed out the bulbs, and also the fuses, but to no avail. I took it to a repair shop, and was told it could be the combo switch. Could it possibly be corrosion with the wiring? Does anybody else have or had this problem with their car? Need some suggestions!