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Old 01-27-2009, 05:16 PM   #11
mattmcl
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OK, two days soaking with a 2oz/gallon Star San solution has done nothing. I'm going to try sodium hydroxide next.

 
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Old 01-27-2009, 06:59 PM   #12
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If it's mineral deposits, try white vinegar. You can get a gallon for like $3 at the store, I'd say dump two of those in there and top off with water.

If it's organic, up your oxyclean ratio (two or three full scoops), but make sure you mix it up outside first, oxyclean has a tendency to cake (shake a bottle of half a scoop and 1-2 quarts of water, dump it in, repeat, top off with water).

That's my two cents. Good luck!
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Old 01-28-2009, 05:36 PM   #13
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Sodium hydroxide hasn't worked. I took a quart of liquid Drano, poured it in and added water to fill (7 gal). I'm wondering if that dilution is too weak though.

I'm about ready to go nuclear on this thing.

 
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Old 01-28-2009, 05:47 PM   #14
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Man, this is getting exciting! I want to see photos!

 
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Old 01-28-2009, 07:20 PM   #15
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You can see the streaking in these pretty well.



 
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Old 01-28-2009, 07:32 PM   #16
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Hot PBW for a day. Until you do that, you're just playing around. Which is fine, since its always good to experiment. But when you finally get tired of the stain, hot PBW should do it. I have yet to see anything that can survive a hot soak in it. Good luck.

 
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Old 01-28-2009, 07:34 PM   #17
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Unless it has etched the glass you should be able to get it off. I'm all for getting more acid and start going for caustic cleaners as well. Maybe hydrochloric (Muriatic) acid would work? I think you can get that from hardware stores.
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Old 01-28-2009, 08:00 PM   #18
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Muriatic acid is what is used in the fish tanking trade to get rid of hard water deposits. Wear gloves. And Rinse! rinse! rinse! when you are done.

 
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Old 01-28-2009, 09:28 PM   #19
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That's what I was thinking of trying. I want to give PBW a shot too.

 
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Old 01-28-2009, 09:35 PM   #20
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Hot PBW, Three Tablespoons to a gallon. By hot, I mean hot tap water. Be careful not to shock the carboy if it is cold. Let it warm to room temp first. Fill it to the neck, cover with saran wrap, let sit for a couple days.

 
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