is ccleaner is the best privacy software , or there are better ones ?
It’s a good one.
Others are ATF-Cleaner (simpler), Glary Utilities, nCleaner, Wise Disk Cleaner.
Firefox has goos privacy extensions also.
This really should be in the General forum as it is unrelated to avast! 4 Home/Pro.
I use it but I certainly wouldn’t call it Privacy Software.