Calling those programs "optimizers" is what I'd call false advertising. They don't really optimize anything. All they really do, is automate a number of tools already included with Windows. None of which optimize anything.
I wouldn't use those programs if they were free myself.
I use Ashampoo WinOptimizer Platinum 3, but the Drive Cleaner will not clean "unnecessary files" it just informs that an error has occurred. Ashampoo support rarely bother reply to requests for help. Could anyone please recommend a similar product from a company that offers support and does not lose interest as soon as they have taken my money?