ATM compressed air

[Adams <adams@rmci.net>]

 My spouse ( God bless her for supporting my hobby ) purchaced  a can of 
compressed air for me ( Ansco Air) so i might clean my telescopes. The 
applications state it can be used  for optical cleaning.( remove dust ) 
The included cautions state not to tilt can more than 40 degrees during 
spraying and before use to press activator to purge valve of any liquid. 
The chemical components are tetrafluoroethane. I have seen posts on this 
site concerning the pitfalls of compressed air, but because this product 
states its uses include cleaning optics, i  was wondering if anyone has 
any additional knowledge or experience concerning this or similar 
products that would validate or prohibit its use. Thank you.

                         Adams@rmci.net
                        Nampa,Idaho U.S.A.