On my W7 install I have a script that starts Pale Moon and runs CCleaner after PM closes.
I have the cleanup options set in PM, but I really want to make sure that the cache and other locations have been cleaned.
It is also supposed to be able to purge Flash cookies.
Windows 7 would be the only OS I'd ever consider using something like CC cleaner on.
Windows 8 and 8.1.1 and so far probably Windows 10, the need for that is gone. I think 10 will be even more stable and less prone to WinRot considering the further push for WinRT development that doesn't allow deep system or registry access and can't leave crap lingering around when uninstalled or installed.
It's much like Windows Phone 8, it's an NT system like on PC. It is Windows for the most part, but is all WinPRT based for apps MAYBE Win32 for native first party stuff. So this means it's incredibly responsive, has no slowdowns, has no oddities that come up, and runs as clean as it did when you first started it up. Hopefully soon one day that will be the norm for EVERY Windows device.
I wonder if they can change coding in Windows 10 with legacy Desktop apps so they run in a Win32 "bubble" much like how WinRT apps run in their own sandboxed bubble.
Ccleaner is a tool.
Like any other tool one must learn how to use it properly.
If one is looking for a one button Fix All then one should not be using a cleaning program.
Like any other tool if used incorrectly it will cause problems.
I use Ccleaner in one fashion or another every day.
Just take the time to learn how to use the program. Don't delete anything if you don't know what it is and what it's used for.
Ccleaner has many functions and capabilities. If one takes the time to learn how to use them it is a very handy tool.
I use CCleaner as well along with WiseCare for years, they are pretty safe.
Some manual tweaks like disabling services, hidden Windows tasks and such.
Lets not forget: WinSxS Folder (Component Store) - Clean Up in Windows 8.1
But for the record, I did some CPU/HDD/GPU testing with a clean Windows setup and after using those tools and tweaks and there was zero difference. They are definitely problem solvers and keep PC clean, but it is not like they speed up PC, though I can feel difference on desktop, but that is subjective.
the cleaners that say they will speed up your computer are usually the one that got on your computer some other way than you installing them and want money first to fix your computer.
Prevent, don't clean. Most "dirt" comes from uninstalled programs, use something like Revo Uninstaller to cleanly uninstall programs + "Disk cleanup" and it should be enough.