Many gerbils enjoy a dust bath. That is dust bath... using Chinchilla sand or dust in a small container big enough for the gerbil to roll around in. You can buy the sand or dust at the pet store. I would not recommend dust or sand found out in the backyard or at the beach. Then chinchilla sand or dust is very small grind.
Guinea Pig Dress Cookie Monster w/White Lace and Bow
In the high plains of South Dakota, USA