For what it's worth. And please don't laugh.
I still have my Zerostat of 30? years ago. In ice white. Effect next to nil.
I religiously clean new cds with Furutech's PC-Alpha spray. The spray is a plastic container, material costs 0.5 euro, filled with 25 ml demineralized water(?), cost 0.01 euro. It retails for euro 25-35 and I can clean about 50 cds with one spray. At least, a microfibre cloth is included in the package to wipe off the cds after spraying. Cost per cd euro abt euro 0.50. The sonic improvement is spectacular.
Just before playing, I always religiously "blow-dry" cds on Audio Revive's RIO-5 coffee blender, complete with tourmaline balls. 15s each side, twice = 1 min. The sonic improvement is spectacular. I experimented with various combinations of demagnetizers, Furutech Destat III, RIO-5. Contrary to others, I concluded that, just before playing, simply blow-drying my cds on the RIO-5 for 1 min delivered the best result. Besides being a coffee addict, I am now a RIO-5 addict (one day, this will be fatal for my RIO-5). The RIO-5 is made of low-cost plastic materials, sports a small fan in its base and yes, tiny tourmaline marbles suspended over the airflow on a grid. I reckon abt euro 50 in material cost, another euro 50 in assembly+overheads. It retails for euro 700.
Another piece of plastic junk with excellent results is de Furutech Destat III. It is designed as a curling stone with batteries in the grip. After replacing the batteries a few times, the battery lid breaks off. This is my third, and I now refuse to buy another one (in use, I hold my thumb on the battery lid). A real scandal, considering Furutech's reputation. Material cost including assembly+overheads: euro 50. It sells for euro 350 (used to be euro 200). Once I put a record on the player and it spins, I apply the Furutech for 30s. above the record. The sonic improvement is spectacular. I used to apply the Furutech to cds just before playing, with clear audible improvements. However, the RIO-5 beats it in no uncertain terms.
Moral: these gimmicks cost nothing when considering HighEnd systems costing tens of thousands, and more. And yet, they improve sound reproduction as if they cost tens of thousands themselves. DS Audio now jumped onto the bandwagon with a gimmick costing euro 1,800, which is more in tune with HighEnd price extravaganza. Audio-Technica, Clearaudio, Marantz, Project, Rega please come to our rescue and offer these gimmicks, better designed, more effective, at much more reasonable prices! You will sell them by the thousands and boost brand awareness.
Note: in another thread, I relay my experience with ultrasound record cleaning machines (Glass vs Degritter 2). Glass does not stand a chance. It should gracefully bow out. Otherwise, Darwinian selection will do the job.