How to clean newly bought plastic cups
1) Put a few slices of lemon peel and orange peel in the cup, or a few drops of vinegar, then soak for one night.
2) When the milk expires and cannot be drunk, the rag can be soaked in the inside to wipe the cup, and the dirt can be removed quickly.
3) Soaking in the rice water for one night is also a very good method. This method can also be applied to glass, stainless steel and ceramic cups.