I hand washed them before first use but while drying I found the remains of canisters. I ended up using clean white paper towels to work all the rough edges and the grayscale continued to come off. I hand wiped with fresh paper towels for a few minutes and ended up leaving no residue. The rest mostly stuck in the creases and creases of the metal - especially around the edge and in the area where the lid is screwed on. After cleaning, I filled one with rice flour and the other with mocha powder. I understand that the grid is not that good in use, so shaking it releases a significant amount of energy that is not evenly distributed. Although it works a few light years earlier than tapping with a spoon, it shouldn't be used at all with something very delicate like powdered sugar.
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