The best way to bathe pet hamsters is to use special bathing sand for dry cleaning. Hamsters usually don't need to be bathed with water because they are native to arid regions and are sensitive to water, and they are prone to getting sick due to moisture. Using bathing sand allows hamsters to roll around in the sand and use the sand to remove dirt and microorganisms from their bodies.
When using bathing sand for hamsters, first, spread a layer of bathing sand in the bathroom, and then gently put the hamster in. Most hamsters will instinctively dig the sand to clean themselves. If a hamster doesn't know how to use the bathing sand, you can gently sprinkle some sand on its back. The hamster will automatically shake off the sand on its body. After repeating this several times, they will learn how to use the bathing sand to bathe.
Besides, when bathing, be careful not to force the hamsters. Try to let them take a bath voluntarily. If a hamster is unwilling to take a bath, you can help it get used to it through guidance and patient training. Meanwhile, make sure to bathe only one hamster at a time to avoid them interfering with each other.