Will certain ingredients cause pigment discoloration?

* Discoloring of the lid may occur when you juice fruits or vegetables with strong colors, such as carrots or beetroot.     
It is recommended that you clean the appliance shortly after use to prevent this.
* Most of the stains can be easily removed in the dishwasher or by washing up in warm water with dishwashing liquid
* If the stains are difficult to remove, try using some cooking oil. Apply some drops of cooking oil on a dish towel or a piece of paper kitchen towel and rub the stains.
* Then clean the parts again in the dishwasher or by hand in warm water with some dishwashing liquid