There are software programs that clean free space.
After using one of these, will CCleaner keep the free space clean?
Alternatively, does CCleaner clean free space?
Welcome to the forum,
CCleaner doesn't clean free space, nor does it keep free space clean. However, CCleaner will give you free space and allow windows to run faster by removing unused files and fixing issues in the registry.
Heres a link to CCleaner Beginner's Guide.
http://www.internetrotsyourbrain.com/ccleanerbeginnersguide/
Let us know if you have any questions.
Jamin4u