It is not necessary to remove the skin or peel. You should only peel fruit with a thick, bitter skin, such as lemons, oranges, grapefruit or pineapples (remove the core). Nor is it necessary to remove the small seeds from watermelon or grapes but you must remove the stones from fruit such as peaches, cherries, etc.
Cleaning of the appliance is easier if it takes place immediately after use. The filter should be pre-cleaned with a soft brush in cold water and handled with care. All removable parts are dishwasher safe with the exception of the juice collector. The juice collector should be washed in soapy water.
No, juice extracted naturally without the addition of any preservatives should be consumed very quickly. In fact, it oxidizes on contact with air and its taste and color may be altered. You can add a few drops of lemon to the juice to stop it going brown so quickly.