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First I borrowed my nextdoor neighbours cat.
I used a can of beer and tap water that I had put through my Brita water filter.
I tilted the truss tube scope downwards so the mirror was vertical.
I shook up the beer can realy well (about two minutes) then just started to pop the top. I directed the spray over the face of the mirror so that it foamed and frothed the gunge away.
Taking the cat (named Puss, cause that's what most 3 year olds name a cat when it is given to them) who loves to be cuddled and actually has a fondness for water, I splashed some of the filtered water across his back, then holding him sideways (which he also enjoys) I gently swabbed the mirror without any pressure. I then poured the remainder of the filtered water over the mirror to wash away any remaining gunge.
Voila!! A new clean mirror. Mind you I'm still cleaning out the car fur.
Almost a true story, minus the cat! But somehow his fur still turns up in my scope!
Moral: You can clean a mirror with anything so long as there are no contaminants. Filtered water is okay, just ensure that there are no droplets left on the mirror, an air can or an air bulb work well.
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