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Oh No, More Stains! 10 Common Food and How to Get Rid Of Them!
First, fill your plastic containers with very hot water.
Add dish soap: 3-4 drops will be enough.
Add the absorbent paper or napkins, so as to fill the jar but not overdo it. Before adding the paper, tear it roughly with your hands.
Close the jar tightly with its lid.
Shake the jar: you need to literally shake it for 30-40 seconds.
Open it and check the stains: if necessary repeat the operation a second time with clean paper and new soap.
Rinse the container under cold running water.
If the containers you are cleaning are old and the yellow stains have been there for a long time, this trick may not be so effective: but you can make several attempts to clean them as much as possible.