This, in my opinion, is a neat contraption; Rotosound's string-cleaning clamp. All we need to do is place our instrument strings between the lid & the base plate, move it across the fretboard & WALLAH! Clean strings.
The base plate also doubles up as a fretboard cleaner so no worries about scratch issues, no? Conflicting information online, to be confirmed.
I feel good playing with clean strings, not necessarily fresh but CLEAN. I deem this important because it affects feel & performance. Psychologically, we tend to give off our best when not worrying about dirt under our fingers during play.