My bicycle became very slow. How to wash a bike wheel hub

Hello, my dear cyclist friends!
Today, a bicycle with a common issue was brought to our bike workshop.
The customer said that his bicycle rides very slowly. The bike has a very weak roll. As soon as the bike picks up speed, it quickly loses it.
We diagnosed the bike and immediately determined that the rear hub needs servicing.
Watch this video tutorial very carefully; I show everything step by step in detail.
After such rear wheel hub servicing, your bike will ride much faster.

00:00 My bicycle became very slow.
00:20 The rear wheel of my bicycle hardly turns.
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