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This topic comprises 6 pages: 1 2 3 4 5 6
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Author
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Topic: Port glass and lens cleaning
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Mark Ogden
Jedi Master Film Handler
Posts: 943
From: Little Falls, N.J.
Registered: Jun 99
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posted 06-11-2002 07:45 AM
Bon Ami is a bathroom clenser that is mostly made of feldspar. While I wouldn't try it on a dichroic reflector, it will otherwise really go to town on a very dirty mirror. I posted the best way to use it a while back the last time this came up, in a thread on reflector cleaning. It's also freakin' GREAT on automobile windshields, it'll take off those little dots of tree sap/bird poop that other cleaners won't touch. If you don't find Bon Ami, don't try Comet or anything else, they're just not the same.Y'know, not to turn this to cars, but I learned something interesting not long ago from a professional auto detailer. He told me that a lot of glass streaking didn't come so much from the cleaning product, but what was used to wipe it on and off with. He advised me never to use a rag that had gone thru a wash cycle with fabric softener, it seems that most glass cleaners will cause the residual softener to leave the rag and streak the glass (and as it turned out, most paper towels, like Bounty, et. al., have a type of softener on them from manufacture. He used plain newsprint paper, which he got from a packing/shipping store. He also raved about a spray glass cleaner, Stoner Invisible Glass, which I've seen at Pep Boys.
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 06-11-2002 12:45 PM
Bon Ami is still available in both powder and cake form:
Link to Bon Ami Although Bon Ami is unlikely to scratch plain glass, it may be abrasive enough to damage an anti-reflection or dichroic coating. ------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
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Manny Knowles
"What are these things and WHY are they BLUE???"
Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002
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posted 06-13-2002 06:27 PM
Note: Bon Ami comes in two kinds of powder. "Bon Ami Cleaning Powder" is the same as the cake form. Bon Ami says that NASA used the powder to clean the windows on the Space Station. Wow!The second type of powder is called "Bon Ami Cleanser" and it contains bleaching agents...I've been able to find this in the local grocery store, but not the "Original Cleaning Powder" or the cake. Looks like they're impossible to find locally. I ordered the Bon Ami cake online. Back to my original point: Be careful not to use the more commonly found "Cleanser" because I'm willing to bet it's not appropriate for the booth windows.
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Manny Knowles
"What are these things and WHY are they BLUE???"
Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002
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posted 06-13-2002 06:29 PM
Richard: Thank you for telling me about Glass Wax. As I mentioned, I couldn't remember the name of the actual product we were using. It wasn't Glass Wax, but I know the product you're talking about. It's a pink liquid, right?Josh: We used Plexus on the aircraft windows. I think NASA and the military use it, too. Still, I can't say if it's gentle enough for a projection booth window. There's also a product called Novus that comes in a kit of three bottles. I use the #2 to remove fine scratches from the iPod, but don't think it's intended as a general-purpose cleaner. It's great for removing scratches though.
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Frank Angel
Film God
Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
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posted 06-14-2002 07:52 PM
Plexiglass is VERY easily scratched. You can use lens cleaning fluid, but you have to apply it and wipe it with a very soft cotton cloth or a shammy cloth, and even then, not to press hard. I once heard that Lexan is harder than generic plexiglass and thus more difficult to scratch, but I wouldn't go on that until it can be verified. The most important thing is, never to rub the surface once the liquid cleaner has evaporated, which is a trick in itself because you as you are wiping it, the liquid is drying. Once there is no liquid on the surface, even soft cloth will scratch plexi. Again, Lexan may resist such easy scratching. But compaired to double side coated waterclear glass, plexi is dirt cheap. Even if you accidently scratch it, you just cut a new piece and replace it. John made the reference to that fact that plexi may pipe light, so it would transmit a bit less light than its more expensive coated glass counterpart, but without seeing the actual number comparison, and going my observation of how each worked in my theatres, I would bet that light transmission loss by using plexi wouldn't be significent, at least not proportional to the cost differential. Frank
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