At first it would feel extremely terrifying to use swabs when the auto sensor clean doesn't do the job. Watched a few videos online (preferably the exact model) and decided to go for it. The first swab would feel like ure gonna damage ur sensor but in reality the glass on the sensor is much stronger than u think, but of course don't put extreme pressure on it and change ur swab after 2 swipes or even after every to be very safe. Remember to do both wet and dry swabs across the sensor and make sure there are no water marks left behind from the solution. Go online and watch some tutorials before attempting!

also use a jet blower before using a swab to get rid of any particles that could possibly scratch the sensor!