I’m not sure you could sanitise cardboard really, I never have, just make sure it looks clean & doesn’t have any kind of dirt or anything on it & it should be fine, make sure to remove any tape that might be on it though.
Just looking back at this thread, I just wanted to add that I still have this blanket It's the hamster blanket and has been used for all the hamsters since. Except now it has a couple of holes (Newt chewed it through the top of the pet carrier).
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