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Old 02-12-2011, 09:28 PM   #1
ReverseApacheMaster
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Default Cleaning mold inside corny?

I have two corny kegs I use for fermentation. I cleaned and sanitized one after use and I guess some water or starsan got left in the bottom in the little indention in the very bottom and it developed a half ring of green mold/fungus.

I tried soaking in a strong oxiclean solution but so far only some of it has come off. I tried reaching in there with a bottle/carboy brush but I can't seem to get all of it off that way either.

Any suggestions on what I could use to scrub out the mold or what will dissolve it without damaging the keg?


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Old 02-12-2011, 09:36 PM   #2
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guess Im lucky, my arm will fit inside mine. you could drop in a green scrubby and take a long spoon and scrub it that way.


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Old 02-14-2011, 11:24 AM   #3
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Since it is mold, kill it first then take it off then sanitize it again.

Boiling water then vinegar then chlorine then rinse then a warm PBW soak and let it sit there for a day.

Rinse then sanitize. If there is still mold, you didn't do the PBW right. Do it again until it is gone.

Overkill? Yup, but then again it's mold in a stainless fermenter. If you do not get it clean you'll have strange problems in your beer until you get rid of it.
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Old 02-14-2011, 11:40 AM   #4
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Quote:
Originally Posted by Egbert View Post
Since it is mold, kill it first then take it off then sanitize it again.

Boiling water then vinegar then chlorine then rinse then a warm PBW soak and let it sit there for a day.

Rinse then sanitize. If there is still mold, you didn't do the PBW right. Do it again until it is gone.

Overkill? Yup, but then again it's mold in a stainless fermenter. If you do not get it clean you'll have strange problems in your beer until you get rid of it.
Just a serious heads up: Do not ever use chlorine (bleach) on Stainless Steel.
This will result in the develoment of pin holes through the SS over time.
How To Brew - Appendix B - Brewing Metallurgy
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Old 02-15-2011, 11:36 AM   #5
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30 seconds of chlorine solution is the least of your worries if you've got an infected fermenter.
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Old 02-15-2011, 02:54 PM   #6
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Get a NEW toilet brush with a long handle. (No potty jokes please).

I used one scoop of oxyclean for 3-4 hours (sprayed) and ALL of the gunk inside a 5-year+ old keg was gone.

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Old 02-15-2011, 03:20 PM   #7
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Bleach for short term use is fine. Restaurants do it all the time in a triple sink sanitation set up. Just take a broom handle or long stick with a cloth or old sock tied on the end and scrub it with some bleach, then rinse.

Bar Keepers Friend might be your best bet.
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Old 02-15-2011, 03:31 PM   #8
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Quote:
Originally Posted by ReverseApacheMaster View Post
I have two corny kegs I use for fermentation. I cleaned and sanitized one after use and I guess some water or starsan got left in the bottom in the little indention in the very bottom and it developed a half ring of green mold/fungus.

I tried soaking in a strong oxiclean solution but so far only some of it has come off. I tried reaching in there with a bottle/carboy brush but I can't seem to get all of it off that way either.

Any suggestions on what I could use to scrub out the mold or what will dissolve it without damaging the keg?
I personally haven't seen the gunk that boiling water/PBW can't remove from a corny. I would pour boiling water (using an aluminum pitcher...be safe) in, mix some PBW and let it sit.
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Old 02-15-2011, 04:09 PM   #9
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Bleach is ok if done quickly. You do NOT want to let it sit there for a while though. And make sure to rinse VERY well. We all know bleach is nasty tasting in beer!

I've kept a small amount of starsan in my kegs lots of time, for months, and have never had a single sign of any fungus. Are you sure you rinsed it out after the last use??


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