I tested Auslogic Registry Cleaner.
It is a aggressive Registry Cleaner. I can't recommend it!
E.g.: It said: "Registry key HKEY_LOCAL_MACHINE\Software\Classes\PCSuiteContactsView\DefaultIcon points to a missing file C. This entry can be removed."
Wrong! "C" exist and it is "C:\"; not a file "C" ... And the file "ContactsView_Nokia.dll" (in Nokia folder) is there...
More: Auslogic is TOO aggressive with "Invalid CLSID" keys!!! E.g.: it says that "Key HKEY_CLASSES_ROOT\XCShInfo.PXCThumbProvider.1\CLSID refers to an invalid CLSID {EBD0B8F4-A9A0-41B7-9695-030CD264D9C8}. This entry can be safely deleted." Wrong! "{EBD0B8F4-A9A0-41B7-9695-030CD264D9C8}" belongs to PDF-XChange Viewer!
It seems Auslogic likes to delete empty keys... It isn't a adviced action also!
I totally disagree, if you use it in the standard mode it NEVER deletes anything that isn't completely safe to do so. I've been using it for over a year and I have let it remove whatever it has detected with no problems or even a thought of having to use a backup. In aggressiveness, it is a lot less aggressive than CCleaner as that program finds things after Auslogics has been run. CCleaner also is totally safe though.
I stated that you probably shouldn't run Auslogics in the advanced mode because then it detects a lot more and they even tell you that it may not be safe to let it delete everything it finds in that mode. Only people who can totally decipher the registry should ever use the advanced mode.
I have three registry cleaners installed, Auslogics, CCleaner, and Registry Mechanic 7. I use them every time I uninstall something but not always in the same order. The one that detects the most when run as the first one is CCleaner. After running that, Auslogics rarely finds anything. If I run Auslogics first, CCleaner always finds some more things afterwards and Registry Mechanic only finds references to moved or deleted files, invalid shortcuts, and entries in applications like 7Zip referring to files that have been extracted with it but that are no longer on the system. All three programs are good and TOTALLY safe. Registry Mechanic also has an option to compact (defragment) the registry and it works very well.
Auslogics is a free safe application as is their excellent free defrag program which I find is the best defragger, bar none.