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Old 01-28-2009, 09:41 PM   #21
Jim Karr
 
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You may also want to try warm water with lots of ammonia....Caustic works great on organic material.
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Old 01-28-2009, 10:05 PM   #22
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So, what do you mean by caustic? I read that it's the same stuff in Drano, so I tried that. Is there something better?

 
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Old 01-29-2009, 01:35 PM   #23
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Draino, although mainly consisting of caustic soda (lye), is formulated to sink and sit in the drain trap. It's not going to dissolve in a big jug of water and eat at stuff it's not directly touching.

You could probably get lye from a chemical supplier if you wanted to go that direction, but BE CAREFUL if you do.

You should probably post some pictures, maybe you've got something that someone else has seen before.
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Old 01-29-2009, 03:11 PM   #24
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From the photos, the stains look like mineral deposits similar to what you see on shower heads in areas that have extremely hard water. Maybe try something like CLR? Information from their website below...

C Instantly removes Calcium deposits from glassware, decanters, tea & coffee pots.
L Instantly removes Lime scales from coffee makers, humidifiers, tubs, toilets & sinks.
R Instantly removes Rust stains from stucco, brick, porcelain, chrome & metals

CLR is the most powerful formula available for dissolving tough calcium and lime deposits and surface rust stains from tubs, toilet bowls, sinks, glass, chrome, fiberglass and stainless steel. CLR is septic safe and contains no phosphates.

 
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Old 01-29-2009, 04:11 PM   #25
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Well, an overnight soak in 1 lb. of PBW:7 gallons hot tap water did nothing.

 
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Old 01-29-2009, 04:49 PM   #26
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This may sound stupid but....are you positive its on the inside? with the chemicals you've put in there it should be gone. it may just be on the outside.

John

 
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Old 01-29-2009, 04:58 PM   #27
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Yeah, the first thing I did was scrub the outside thoroughly. The outside is super smooth.

 
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Old 01-29-2009, 05:08 PM   #28
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It doesn't look etched on... but I suppose it may be, you've definitely done a lot of work on it.
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Old 01-29-2009, 05:09 PM   #29
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Quote:
Originally Posted by jspence1 View Post
This may sound stupid but....are you positive its on the inside? with the chemicals you've put in there it should be gone. it may just be on the outside.

John
If it is on the outside, then it can't hurt your beer. But even if it IS on the inside, at this point its fairly safe to say it can't hurt your beer. What are the chances that none of these chemicals can remove the stain, but somehow it gets dissolved into your next batch of brew? I say relax, don't worry, have a homebrew.

 
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Old 01-29-2009, 05:16 PM   #30
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If you put too much more work into that carboy, you will have probably spent enough money to buy a new one. That said, it looks like calcium deposits from hard water perhaps, I say try the muriatic acid. Also, the Star San is getting cloudy likely because of minerals in your tap water making it ineffective, if you filled the carboy with distilled water you likely wouldn't have this problem, and it may work.
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