Water
NO. you can use Chinchilla sand for your hamster to bathe in though
don't bathe a hamster
No
A pet store will have a powder designed for this.
All hamster have a smell unless you bathe them
None! Hamsters groom themselves.
Do not bathe your hamster unless a vet you trust advises you otherwise. You can brush your hamster with a soft-bristled tooth brush, but do not immerse him or her in water.
You should NEVER give your hamster a bath. They clean themselves. If your noticing odor buy some chinchilla bath powder and just let your hamster be in it. But you never give a hamster a normal bath!
Hamsters do not bathe in bodies of water, they groom themselves with their own tongue and paws.
It is not recommended to give a hamster a bath as it can be stressful and harmful to their health. Hamsters are naturally clean animals and groom themselves regularly. If your hamster gets dirty, you can spot clean them with a damp cloth or use a chinchilla sand bath for them to roll in.
If you have a short haired hamster like a Syrian then it cleans itself. If your hamster is long haired then you have to brush it depending on the length and thickness of its hair. Never bathe your hamster, they hate water and lick themselves to keep clean anyway.
It is not recommended to bathe your hamster unless it is absolutely necessary, such as if they have soiled themselves or are visibly dirty. Bathing can strip the hamster's fur of natural oils and disrupt their skin's pH balance, leading to health issues. Hamsters are generally adept at grooming themselves and do not require regular baths.