There is nothing complicated and you can drain the plum yourself. To do this, you need to choose ripe, tight fruits, rinse and dry. It is advisable to take varieties of sweet and hard. I do not take out the bones.
Further lay out on a dry, preferably wooden surface in the sun. Periodically drive away the insects and turn fruits. At night it is advisable to bring in the house. After a week, depending on the sun, drainage drained into the shade and dried in the shade for a few more days.
Prunes are ready if the fruit does not give off juice when pressed, but remain elastic and elastic.
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From @v0inter