Oh my gosh! DO NOT give your hamster a bath. Hamsters naturally groom themselves. If your hamster smells very bad there is probably something wrong. It could be suffering from many things. Make sure he/she’s moving around normally, keep the cage very clean, possibly try a different location for the cage, or try some different bedding products. Make sure your hamsters face and front legs are not wet. If so, your hamster is probably sick and doesn’t have the want to clean itself as normal. Hope this helps!