Do you have fake muscle milk protein powder? Is it particularly sweet? I bought bananas, which are very sweet. When I washed it, there were Theo granules like sugar at the bottom of the cup.
Things may not be fake, but what you say is sweet. In order to reduce the cost, many additives will be added, such as sugar, starch, essence and so on. Too much of these things will inevitably not dissolve easily, and they will stick when washed. Because the solubility of sugar is limited. If you want to gain muscle, it is recommended to buy high-quality whey protein powder instead of additives and flavors. Because protein powder contains too much sugar, it will be absorbed into the body and converted into fat, which can not achieve the effect of fitness and stretching muscles.