How do you get mold off your alto saxophone?

You have to buy a swab to swab all of the moisture out of your sax. A microfiber swab is preferred. A neck cleaner (this is more use for tenor than alto sax) is to clean out grime from the neck, and a polishing clouth to clean the outside. Doing this will help intonation and production of a better sound. This will also make playing a lot easier

Every month or so I just boil my mouthpiece and gooseneck without the cork or pad on, the only thing you can do with the body is just pull a cloth through it every time you play though, unless you get it cleaned professionally, but it can take hours.