Best way to audit guest user access

Occasional Contributor

My client wants to turn on external sharing for 'new and exiting guests' for a number of SharePoint sites. They have asked for a way to periodically audit sharing links, so they can remove access that's no longer needed.
I have tried running reports in the Compliance Centre but the info returned in not particularly usable. 
What is the best way to do this? 

 

Thanks

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