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Message: <blockquote data-quote="Binastro" data-source="post: 3423562" data-attributes="member: 111403">Using compressed air isn't as good as suggested in the video.The camera shop guy squirted the compressed air onto a lens and a whole lot of gunge came out on to the lens.It took him ages to get it off.It was really hilarious to watch.I used a large jewellers bulb with a valve.It is experience that counts.Living by the sea means you have to be more aware of salt.I clean optics as little as possible.But if I need to do it I am careful.Except with my glasses and the barmaid called Salty.P.S.Front surface mirrors even with silican dioxide overcoats, as in the Edmunds video, are more delicate than hard multicoated modern lenses.Although water repellent coatings may be softer than hard anti reflection coatings.Without an overcoat a front surface mirror is very delicate. They traditionally had aluminium coatings but nowadays maybe enhanced silver?</blockquote>