Soda blasting works great too. One key aspect is baking soda will dissolve in water, so after you blast the carb just soak it in some hot water for a few minutes. Therefore no material will be left/stuck in any nooks and crannies; whereas any other material could potentially get lodged in the carb. It is also a very mild abrasive. It does a hell of a just removing dirt and grime without tearing into the aluminum.