Hi Paul,
Thank you for choosing Windows and thanks for providing us an opportunity to assist you.
As per the description, you are having issues with emptying the Cache.
Method 1: Perform the steps mentioned below and check if it helps.
a: Open Internet Explorer.
b: Click Tools > Internet Options.
c: Then click the General Tab.
d: Click the Delete button under Browsing history
e: Now place a checkmark on the option Temporary Internet files and website files.
f: Then click Delete.
Method 2: Perform steps from the link and check.
Reply to us if you face any issues with Cache or any other Windows Issue, and we would be glad to assist you.
Have a nice day!
Hope this information helps.