CCleaner Scam

Dale,

I haven't encountered the particular problem you experienced.... but then again, I must confess that I don't keep CCleaner up-to-date.   I run CCleaner weekly on one of my two Win10 systems [but almost never on the other one... let's face it, drives today have so much gigabyte capacity that even deleting a few hundred megabytes doesn't amount to more than "a hill of beans"].   You should be able to set your browser(s) to empty their cache upon exit, and you should periodically empty your recycle bin. 

By the way, Microsoft gives us DISK CLEANUP (you can request this in the search window of your task bar) --- but you'll have to decide which of the file groupings listed you want to remove.   You can (scroll down as needed and) click on each type, to see a description of what [and how much] will be removed if you check that category.   

Here's a link to an article that may help you decide:  How to Use Disk Cleanup in Windows 10 (howtogeek.com)

Feel free to Google additional advice, if you have any questions.   And when in doubt, it's always safer to leave something there than to remove it.
Personally, I like to keep the (many) thumbnails.... because while safe to remove, their recreation (on as as-needed basis) can slow down displays within File Explorer.

Note that there's a separate button to click, to clean up system files.   This may clean up a LOT of space, because it removes huge files "left-over" by Windows Update.   Be advised that doing so can be time-consuming, depending on how much there is to remove [and the speed of your CPU & drive].   Also, you want to be sure you'll never need to uninstall or "downgrade" an update, because that option may no longer be available to you after "clean its files away".

And yes, the two-factor sign-in to these forums is very annoying.   We have complained about it, but don't know that anything is going to change.

Thanks for the tips.  On the plus side, it has kept me signed in all day today. With the SSD drive I don't shut down until bedtime, just put it to sleep 

Here is another article which discusses more of the file categories in Disk Cleanup:  Is It Safe to Delete Everything in Windows' Disk Cleanup? (howtogeek.com)