Just look up the MSDS!
The safe and inert ingredients are generally omitted from the MSDS, but one can infer them.
You'll see the first type is a mix of highly flammable petroleum and HFC solvents (same as refrigerants). (NB: the HFCs destroy the ozone layer at a far slower rate than the HCFC refrigerants which they replaced, but these are strong greenhouse gases which contribute to global warming.)
I stripped out the relevant bits so everyone may be enlightened.
QD Contact Cleaner 03130
2-methylpentane (similar to hexane) 30 - 40%
1,1-difluoroethane HFC-152a 20 - 30%
naphtha (petroleum), hydrotreated 20 - 30%
n-hexane 5 - 10%
2,2,4-trimethylpentane 3 - 5%
isopropyl alcohol 1 - 3%
n-pentane 1 - 3%
2,2-dimethylbutane < 1%
2,3-dimethylbutane < 1%
3-methylpentane < 1%
CRC Contact Cleaner 2000
COzol 401 80 - 90%
Carbon dioxide 5 - 10%
Decafluoropentane HFC 43-10mee 5 - 10%
Methanol < 0.2%
So what's that COzol? Some sort of proprietary blend:
Component Oral LD50 (rat) Dermal LD50 (rabbit) Inhalation LC50 (rat)
COzol® 401 (Ingredient #1) 1235 mg/kg > 5 g/kg 24,100 ppm
COzol® 401 (Ingredient #2) > 2000 mg/kg No data No data
COzol® 401 (Ingredient #3) 5000 mg/kg 12,800 mg/kg 16,000 ppm/8H
COzol® 401 (Ingredient #4) 6653 mg/kg No data 15,000 ppm
The high LD50 (the amount killing half of the animals) suggests this is a blend of detergents and surfactants.
So we can hazard a guess that the concealed ingredients are likely something along the lines of oleic acid (olive oil and most human fat is oleic acid, so don't sweat it) and palmitic acid, which will solubilize the metal salts (corrosion). Same as in De-Ox-It!. No magic here.
This concealment is such nonsense. Anyone with a decent lab could identify it in fifteen minutes, all computerized nowadays, no secrets.