Recommended way to remove DC 'spike' in Rx / Tx?

So… what is the recommended way of dealing with the DC spike in Tx / Rx in, for example Pothos or the various SDR programs?

LimeSuite GUI has a calibration for Rx / Tx. Who knows if this is sticky in EEPROM. Or over what frequencies?

Not been able to find this basic practical information in the wiki.

I see that this user has the same Question: