"Real" random writes will lead to orphaned blocks, however, there aren't many of those for the normal windows user.

I have never found any of my SF drives to perform cleaning during idle time.

I do run Intel's Toolbox cleaning on the X25 series drives from time to time (not often) and it does show that it works if comparing HDTune maps before and after.
We should perform a test to check if the Toolbox cleaning actually does or leads to anything at all on Intel's SF drives.