[Aavso-photometry] RE: Crud on Filters--Solvent Found??

[Wclark3 at cs.com]

In a message dated 10/25/05 7:29:31 PM Central Daylight Time, 
bailyhill at aol.com writes:


> This sounds a little too good to be true, but I may have found the 
> solvent to get rid of the crud on B and V filters.
> 
>  
> 
>   So I took the filter wheel out, and there was a whitish coating on one 
> side of the B and V filter. I went to the medicine cabinet to see if 
> alcohol would touch it, expecting that it would not, based on the 
> feedback from others on the list. Well, there was no alcohol, but I did 
> have some 3% Hydrogen Peroxide. So I tried it, and much to my surprise, 
> it cleaned right off.
> 
>   Well I do not know if your crud is the same as mine, but I do have 
> Schueler filters and it looked the same. Try this and let me know if 
> you have the same good fortune that I did. My filter is clean as a 
> whistle. I used a pure cotton swab and some pure cotton cue tips. Clean 
> like any other optic.
> 

I just tried using the hydrogen peroxide without any noticeable improvement.  
Medical q-tips and microfiber optical cleaning was used.  My crud was not a 
whitish coating.  It was more like a glob of gunk that oozed in from an edge 
and was not uniform over the surface. It was more like a glob of glue or filler 
that oozed up from the edge. The filters are Schueler filters.

Wayne Clark