It depends on the type of GAN system. As I recieved the GAN X with Numerical IPG 4 days ago, I am unfamiliar with the IPG v3 or v5. However, what I would recommend for about any type of nut is simply to clean it with soap and water, and preferably a microfiber cloth. Other than that, just putting it under the sink for ~ 5-10 seconds and then cleaning it off with a microfiber cloth or paper towel probably works as well. The second method would probably help with avoiding corrosion more, however, and other than that I'm out of ideas. Hope I could help.