Re: Cleaning Solvents

From: Chris L Peterson (clp_at_alumni.caltech.edu)
Date: 08/19/04 

Date: Thu, 19 Aug 2004 01:15:59 GMT

On 19 Aug 2004 00:43:34 GMT, jb2269@aol.com (Jb2269) wrote:

> Started cleaning the corrector on my MN-71 and ran into some problems.
>Using windex from a fresh spray bottle and cotton balls the debris was easily
>removed but after multiple swabs with fresh solvent a spotty film appears as
>the surface dries.
> At this point I am baffled and start evaporating a bulk sample of Windex
>down and to my surprise lots of spots formed and there was some low volatiility
>gunk that took ~12 hours to evaporate! BTW during this testing I found a #14
>welding glass was the best substrate to find residues, the deposit stands out
>clearly.
> Now two samples of 91% CVS IPA were evaporated down and they both left
>residue but different levels. Almost perfect results were obtained with
>distilled water, only a vanishingly small trace of a deposit.
> On the basis of this data it seems a precleaning with Windex followed by
>distilled water is the way to go. Does this seem reasonable?

Yes. My system of cleaning most coated optics is to use Windex followed by
breath moisture (which is quite pure if you don't breathe so hard that it
becomes disgustingly impure!)

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

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