How to purge the retained MQTT messages?

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Ref this post from 2019:

How to purge the retained messages?

If you have mqtt issues with tasmota devices, you can effectively clear mqtt retain messages with tasmota device manager. Take a look at this

And if you have other devices and detailed info check out this

You can also use this:

You purge a retained message by publishing an empty string to the topic as a retained message. It’s as simple as that.

You can do it directly from Developer tools > Services.

In the following screenshot, we are publishing an empty string (represented by two consecutive single quotes) to the topic your/topic/goes/here/ as a retained message (retain: true).

Screenshot from 2021-01-13 21-31-39