Using household chlorine bleach diluted in water is not recommended for sanitizing as it does not contain any cleaner and could damage some O-rings and plastic components.
Changing scraper blades on a regular basis is a critical maintenance task. When scraper blades are not in good condition, they leave a film of frozen product on the cylinder walls. This layer builds up and acts as an insulator, increasing product freezing times. In soft-serve equipment, soft product from the refrigeration system will run longer and overbeat the product.
Another key to maintaining air-cooled refrigeration equipment is to clean the condenser at least once a month. Dust, lint and debris can build up on the condenser and cause some of the same symptoms as not changing the blades. With water-cooled equipment, operators should make sure that the water supply valve is completely open and that there are no kinks in the water hoses.