Instructions
Let Nature Take Its Course
Provide your gerbil with a playmate. If you don't want your gerbil to breed, put a gerbil of the same sex in the cage. Gerbils naturally groom each other, and your gerbil's playmate will know how to groom it, even with a bald patch.
Place some sand in your gerbil's cage. While gerbils naturally groom themselves, they also enjoy rolling around in sand as a grooming aid. The sand actually helps keep their coats clean, and will not adversely affect any bald patches.
Clean your gerbil's cage once every one to two weeks. Gerbils are generally very clean and do not urinate frequently, so it is not necessary to clean the cage every day. By cleaning the cage every week or two, though, it will help your gerbil or gerbils groom themselves and keep themselves clean.
Groom Them Yourself
Take the gerbil out of its cage and hold it in your hand or place it in a small, enclosed area.
Use a product such as "Smell Good Critter Spray" by holding it about a foot away from your gerbil and spraying the gerbil's fur several times. Do not spray directly on the gerbil's bald patch.
Run your fingers through the gerbil's fur to spread the cleaning spray around. Avoid getting spray on the bald patch.
Return your gerbil to his or her cage.
How to Groom a Gerbil With a Bald Patch
Gerbils are social rodents, enjoy being in pairs or groups and make good pets. More active than hamsters, gerbils require stimulation such as toys, exercise wheels and time outside the cage. Territorial by nature, gerbils have a scent gland on their abdomen that is not covered with fur. This bald spot over the scent gland is usually bigger in males than females. Bald spots can also be caused by nervous chewing of the fur, called barbering.