I know many R-Wipe & Clean users, but I think none of them use R-Wipe & Clean to clean up free disk space.
Compared to other Windows cleaners, the main advantage of the R-Wipe & Clean is its ability to detect and remove all kinds of traces both in the system itself and in browsers and third-party applications, even in games.
Even some former CCleaner developers told me that some traces being removed by CCleaner were originally being removed in R-Wipe & Clean.
Also R-Wipe & Clean has a touch interface, very convenient on tablets and Surface.
I haven't used laptops with HDD for many years.
I don’t see the point in cleaning free space on an SSD, since I've never been able to recover the contents of accidentally deleted files on such disks.
Sometimes I clean MFT to remove stored names of deleted files.
I think this works perfectly.
Only, unlike other utilities specifically designed for cleaning disks, for some reason the R-Wipe & Clean creates temporary files on the disk being cleaned.
In the menu on the Settings tab, you can view Free Drive Space and Files Wiping.
I use Zeroes or Pseudo-random cleaning algorithms.
I think more complex algorithms are not needed for SSDs.