In a webmaster hangout, Google’s John Mueller said that you should not disavow links that are not relevant anymore:
“Disavowing backlinks is really mostly for the case where there are really problematic links pointing to your page and you want to say ‘I want nothing to do with that’.
In a case like this [ecommerce site that sells fewer products than before], where these links might be completely normal links to your web site, they are just for older products or things you no longer provide, then that is something you don’t really disavow them for.
Because this is something, that as a company, you kind of build up value over time – years – and it is normal that companies change their focus from time to time, or shift their focus slightly. So that is not really the type of situation where you want to disavow links.”
You can view the video here:
How to find bad backlinks
The Link Disinfection tool in SEOprofiler helps you to find bad links that point to your site. If you haven’t done it yet, try SEOprofiler now: