Do not expose photographs or cameras to direct sunlight during the warmer months. Waving the film around will not help it dry any faster either. During the cold periods of winter, leave the camera in a dark colored camera bag and lay it in the sunlight. This will help speed the exposure time of the film, but only when the outside temps are below forty. Placing the ejected film close to your body will also insure better photographs.
C lean the internal film rollers occasionally.
This is done with a soft tack cloth, which removes any small debris. Also clean the electrical contacts inside the film slot, each package of Insta-matic film has a self contained battery pack, these contacts should be cleaned periodically. It is a lint free paper and is available at just about any camera shop or film lab. Keep all photography equipment in a camera bag, this keeps out dirt and moisture. So take care of that instant camera, it provides you with a memory that lasts all day.