It is generally better to use organic products, without pesticides. If you are not able to get your hands on some, you might as well peel the fruits & vegetables before you blend them, wash them with OZON machine, add a few drops of CYTRICIDAL or by using special salt.
You must clean the rotten places of the fruit and wash the fruit and vegetables well before the blending.
You can blend all fruits and vegetables together without peeling them first EXCEPT Oranges, Grape Fruit, Kiwi, Papaya and in case the products are waxed you should rather peel them all.
All the big pits from Peaches, Plums etc, must be removed immediately before the blending. Small pits from Lemons, Sweet Lemons, Melons, Grapes etc can be left as they are inside the fruits. There is an exception that applies to Apples where you must remove the pits before the blending.
Carrot leaves are not used for juice.
Bananas, Avocanto, and nuts cannot be blended alone. You must first blend all the other fruits, empty the juice and then mix them all together.
It is always preffered if you make the juice right before you drink it. If your time is limited and you want to drink the juice during the day, you can put it in a dark glass bottle, in the fridge.