I suspected a bit of pun Trev.
Seriously; it's a mixed bag of procedures out there for cleaning telescope mirror optics.
Windex has been recommended for cleaning lens; and in some cases using a diluted solution for cleaning and maintaining reflectivity of the mirror.
Though Windex is reported to have some heavy impurities; that over time are reported to eat away(be corrosive) at the mirror coatings and in some cases cause fogging and more streaking then intended during the cleaning process.
A real pain in the a$$ that one might want to avoid.
There's so many recommendations and caution out there it's not funny.