Our girls and guys over at the Advanced Development and Special Projects Division (AD SPD), Research and Development (R&D) department uses the following as per Manufacturer's Maintenance Manual (MMM) and Standard Operating Procedure (SOP) for cleaning multimillion dollar, ultra sensitive Electro-Optics (EO) package with a 70mm CCD / CMOS sensor array (nine to ten times larger than conventional 35mm full-frame sensor) used in airborne Intelligence, Surveillance, Target Acquisition, and Reconnaissance (ISTAR) platforms classified "Above Top Secret (ATS)" and codenamed "Extreme Oh Oh Char Kway Teow (EO2 CKT)" and "Kopi Gao Gao Gao (KG3)".
Purified deionised (DI (electrical conductivity < 11 µS/cm)) and distilled (DT) water conforming to ISO 3696.
According to the Material Safety Data Sheet (MSDS) for Photographic Solutions' (Photosol) Eclipse bottled optical cleaning fluid / solution, it is simply Methyl Alcohol (Methanol). We got Methyl Alcohol (Methanol) from ExxonMobil Chemical or Royal Dutch Shell Chemicals at ~ 99.99% purity for ~ S$20.00 to S$30.00 (5 litters) though I may suggest a change to ~ 99.99% Ethanol or Isopropyl Alcohol (IPA) as it is less toxic as compared to Methyl Alcohol (Methanol) when I further refine my plans for continued Risk Management and Mitigation. Antistatic (Electrostatic Discharge (ESD) Safe) and lint-free Kimberly-Clark Kimtech Scientific Precision tissue wipes for at most only a few dollars per box with 280 tissue wipes (safety lockout pad not included).
We also air clean prior and after with ~ 100 PSI of compressed High-Efficiency Particulate Air (HEPA) with no more than 0.03 particles greater than 0.3 micrometre (µm) conforming to ISO 14644-1, of course one doesn’t have to use HEPA, purified deionised (DI), distilled (DT) water for consumer electronics. My point is some affordable ~ 99.99% Isopropyl Alcohol (IPA) or Methyl Alcohol (Methanol) that can last a lifetime along with boxes of Antistatic (Electrostatic Discharge (ESD) Safe) and lint-free tissue wipes is enough. Don't have to go for all those fancy and overpriced gimmicks that are simply repackaged products (Eclipse , Pec*Pads, SensorKlear etc. etc.).