It's best to use fresh fruits and vegetables, but frozen fruits and vegetables can be used as well to make smoothies and shakes. If there are a lot of seeds, its best to let the fruits and vegetables defrost and sieve the seeds afterwards.
You only need to remove the hard seeds and the skin of the fruits you normally wouldn't eat either.
Clean the individual parts in warm soapy water or in the dishwasher, the electrical part with a damp cloth and a little detergent.
Disassemble all parts and subsequently reassemble in the correct order.
Step 1: Unplug the device. Step 2: Remove the loose parts and clean them, they can be washed in the dishwasher. Step 3: Clean the outside of the device with a soft damp cloth. Caution: 1) Never use any abrasive or aggressive cleaners. 2) Never immerse the appliance in water or any other liquid.
You can use both hard and soft fruit types, as long as they are juicy. Most of the fruits don't have to be pealed, only be washed. Citrus fruits and melon should be pealed because the skin has a bas taste and can be dirty.
All citrus fruits like oranges, lemons and grapefruit
You are exerting too much pressure, or using excessively large fruit.