there are some websites claiming that data deleted using CCLEANER can be recovered using various software on laptop or pc. so my question is that Is it true? if yes, how do I remove those files permanently?
regards
CC's normal file deletion is just that, the equivalent of a shift/del, so any of these deleted files could be recovered before they are overwritten. If you have secure file deletion checked then the files that CC deletes can't be recovered with or without software. However there are log files, journal , and probably other places that contain some file data, which have been the downfall of many a poor lad.
CC isn't a forensic cleaner, but it's good enough for me, and I'm mainly concerned about passwords and banking details. An occasional wipe free space, with a wipe MFT if you want, followed by a Recuva deep scan, select all, overwrite all, is a reasonable procedure, in my opinion.
As SSD is far more secure than a HDD, and an occasional optimise should suffice.
Many people are paraniod about erasing deleted data and will go to great lengths to smite it asunder, but take few precautions about securing their live data. It's always been a puzzle to me.