Let's see how to remove a customer in Plesk.
1) Click Customers.

2) Select the customer.

3) Then click Remove, and click Yes to confirm.

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Removing a subscription is done basically the same way.
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4) Click Subscriptions.

5) Check the box next to the subscription.

6) And click Remove.

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That's it! Now you know how to remove customers and subscriptions in Plesk.