Like you said, it is likely a product intended only for industrial/commercial users, not for sale to the general public. We have a lot of products like that where I work. Shame, cuz some of it's REALLY good stuff, but are likely not sold publicly due to hazardous contents that our litigous public would sue the daylights out of the manufacturers.

Please do let us know if they'll sell it. I've tried practically every glass cleaner sold and not 100% satisfied with the results of any. I've been using some optical polish from work, but it's VERY expensive (it's for small optical lenses, enough to do a Crossfire is about $50!) and you have to wear gloves while using if you like to keep skin on your fingers.