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Old 01-25-2013, 05:10 PM   #11
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I'd try a PBW soak, followed by a scrub, followed by an acid wash if anything remains. I'm drawing a blank on a suitable acid. Maybe muriatic? Brush up on your Mol calculations to figure the volume per gallon of water.

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Old 01-25-2013, 05:38 PM   #12
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Yknow what might work, might NOT work, but would more than likely NOT HURT.... denture tablets. We used to use them to scour out musket fouling from the bores of our Springfields.
Had me curious... MSDS:

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SODIUM CARBONATE 497-19-8 11
POTASSIUM PEROXYMONOSULFATE 10058-23-8 10
SODIUM PERBORATE MONOHYDRATE 10332-33-9 10
NON-HAZARDOUS INGREDIENTS Unassigned 49
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Old 01-25-2013, 05:57 PM   #13
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Of course you want to wash/rinse/sanitize afterwards... but I would think it would be good at breaking up gunk.

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Old 01-25-2013, 06:28 PM   #14
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You need something acidic, like to aforementioned vinegar, or CLR, lime-away, coffee pot cleaner, and possibly best of all, Starsan (mix it up a little stronger, like 1 tsp in 2 cup H20 and swirl it around)

It should take all of 1 min. to dissolve the little crystals.

Anything with a basic pH will do nothing, no matter how strong

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Old 01-25-2013, 07:06 PM   #15
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Actually, base washing glass is extremely effective. Either base or acid, but either way, make sure its at least 3 pH away from neutral to utilize it.

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Old 01-25-2013, 07:15 PM   #16
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Actually, base washing glass is extremely effective. Either base or acid, but either way, make sure its at least 3 pH away from neutral to utilize it.
This is absolutely true, bases are great for cleaning, but for those crystals specifically, it needs to be acid
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Old 01-26-2013, 08:37 AM   #17
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Originally Posted by pjj2ba View Post
You need something acidic, like to aforementioned vinegar, or CLR, lime-away, coffee pot cleaner, and possibly best of all, Starsan (mix it up a little stronger, like 1 tsp in 2 cup H20 and swirl it around)

It should take all of 1 min. to dissolve the little crystals.

Anything with a basic pH will do nothing, no matter how strong
Agree.
I had several old carboys with this "white stuff" inside. Few minutes with hydrochloric acid does the trick.
Just rinse well after.
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Old 01-27-2013, 12:58 AM   #18
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I'd try a PBW soak, followed by a scrub, followed by an acid wash if anything remains. I'm drawing a blank on a suitable acid. Maybe muriatic? Brush up on your Mol calculations to figure the volume per gallon of water.
This. I use muriatic acid for quite a few different tasks that involved dissolving solids. Ensure it is sufficiently diluted and use extreme caution using this stuff. Its nasty. Thorough rinsing afterwards and you are good. Its cheap too.
I use it a good bit for cleaning equipment which I use in my saltwater aquarium, as well as lowering the pH in our pool when it was in operation.
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Old 01-27-2013, 07:01 AM   #19
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I have had stuff like that build up on my carboys and 1gal fermentors. I usually do a very hot oxyclean soak. Then once its cold down i dump a bit out and shake. I keep on shaking till i see thats its fully clean. You might want to try that.

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Old 01-29-2013, 12:01 AM   #20
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Actually folks, a bit of water and starsan wiped it all out.

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