Turn Signal Switch not functioning correctly

The 77 LeBaron's turn signal switch is very slow to not flashing on the left turn side , on the right it is OK . I just took out the rear left tail light housing and cleaned them and replaced all connections correctly. Or is it just time to replace the switch and if so is it difficult I see they are very cheap online . Or does the switch just need a good cleaning ?
Author: 77 LeBaron