A problem solved is always a nice beginning of the new year
It is ofcourse your money, but the free version of CCleaner will work good enough for "home use".
avast CleanUp is a brand new tool.
I'm sure it will be improved in the (near) future.
I do however see no need to buy it (nor any simular tool).
There are free tools (e.g. CCleaner and the Glary Utilities) that do the same.