I saw that stuff many years ago but never tried it. The older stuff was an eather based coloiden or someting like that. You smear it on, layer a gause into it.. when it dried just peel it off. It was very poplar with astronmers to clean their optics. It was also very very expensive.

I jsut use paint store denatured alcohol on a small pad, being carefull not to get it into the elements where it an take the blackening off the edges.

let me know if you get it n how you liked the results?