An update: When I first asked in the Microsoft Community about a Shredding App, a so-called "Independent Advisor" *** in the Microsoft Community advised me against using CCleaner - he said it would 'corrupt' my system! So I've put him on the spot https://answers.microsoft.com/en-us/windows/forum/windows_10-security/what-apps-are-best-to-shred-items-when-you-empty/77b755e9-2d06-45a5-b6d1-6c697ba13b84?tm=1588767004147
*** In case you're not aware of these "Independent Advisors", they get paid by Microsoft. The decision by MS to pay was lambasted by the vast majority of the regular experts,