First thing I've learned with disks -back in the days, but still strong in my brainstem
- is : never touch the surface with anything or it's dead instantly.
Which explains how stunned I was 1-2 years ago when I learned about this methods of cleaning. I never tried it myself, but there are quite some sources (including JanBeta IIRC) who recommend this, so I'm sure it works.
Note that you can 3d-print two simple tools, one to keep the lid open, and one to turn the disk easily and thus removing the need to open the case. I dont have the link available now, but can find it if needed.
edit:
Didnt find a thingiverse entry, but an
ebay offer for this tool. (click on: see original listing)