You can dip a Qtip in betadine and sort of scrape out the puss and dead skin. Then, hold his head facing downward, and squirt a some betadine rinse over his infected tissue.

I've diluted the betadine to a dark tea color in water for rinsing, and it's worked well.

I've heard people saying to use listerine, I advise against this. Listerine burns like a mutha for one, and the betadine will do a better job of cleansing.