I guess from your OP that you are using Avast Free version.
I would not get too excited about Avast reporting numerous junk files as part of their campaign to get you to purchase their Cleanup paid for component, especially if you have used CCleaner.
I would de-select the "Cleanup" item from your list of installed Avast components, by going to Menu>Settings>Troubleshooting>Add/Modify Components. Then untick "Cleanup" component from the list.