Mold In My Homebrew Beer Bottles

I know for a fact that mold is not an awesome beer ingredient. Don’t ask how I know for a fact, that’s another story. Let’s just say I learned the hard way that I need to make sure that the beer bottles I’m using for homebrewing are mold free.

How do I keep my hombrew bottles mold free?

First, after I enjoy a homebrew, I rinse it immediately to get rid of any of the remaining beer or sediment in the bottle.

Then I let the bottles dry before putting them away in storage. Just air drying them is good, but using a beer bottle tree is even better. It dries them upside down, eliminating any liquid that could turn into mold.

It also doesn’t hurt to store the bottles upside down if possible.

What to do if my homebrew bottles have mold?

Even after rinsing the bottles, I still had some that managed to end up with mold inside of them.

The best solution that I’ve tried is letting the moldy bottles soak over night in bleach. It worked 99% of the time. I know other people that use Oxyclean or PBW (Powder Brewery Wash), but I stick to the bleach.

You can also use a bottle brush to get into the hard to reach spots in the bottle. Plus, you can use bottle washer that attaches to your sink to rinse the bottles clean.

Photo by ilovebutter


I'm a former coffee blogger, but I’ve been getting to know some really good craft beers and really getting into home brewing. I couldn’t resist starting this little project called Passion For The Pint. When I’m not blogging about coffee or beer, you can find me exploring New Orleans’ wide range of eateries, rooting for the New York Yankees (don’t hate me, I’m originally from New York), working out to burn off the beer calories or reading about beer.


  1. My mold-prevention protocol: rinse immediately and drain; then down to the brewshop for a jet wash and drying on the bottle tree. The immediate rinse is especially critical after a party as people tend to put stuff in empty beer bottles. Back in the day it was usually cigarette butts, but now it’s stuff like candy wrappers, toothpicks from the hors d’oeuvres, etc.

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