Limiting contact to cleaning is fine until he starts eating for you. As for how he knows your not food, you don't smell like a rodent. If you were to handle a rat or mouse than try to handle him there is a good chance he might think you were food. Sizes I think also plays a factor in their determination of food.
It's also important to note that there two different types of bites. Biting and constricting is a feeding response, just biting is a defensive action and tends to be over before you even realize you got bit.
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