I believe the macro for removing Nvidia Installation Files in the current version of CCleaner is incomplete.
After running CCleaner with Nvidia checked for cleaning I am still left with 3GB of temperary installer assets in "C:\Program Files\NVIDIA Corporation\Installer2".
As per LifeHacker, this folder should be safe for deletion.
I assume this was overlooked during creation of this specific macro.
EDIT: I also found it helpful to delete the files in the NetService folder created by Geforce Experience as-well. Location is "C:\ProgramData\NVIDIA Corporation\NetService" - found a reference that indicated it safe to delete. Backed up folder but no issues so-far after a restart.