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Back in January, I broke down a few of my corny kegs and noticed a good deal of build-up inside of the dip tube. I'm afraid that might be why my lines pour a bit foamy despite the fact that the system seems to be fairly well-balanced. My process for cleaning my kegs is, generally, always the same: once I've run empty on beer, I'll depressurize the keg, take off the lid, rinse it out, fill it about halfway with water and add a half scoop of OxiClean before soaking it. Afterwards, I put the lid back on before turning the keg upside down and allowing it to soak again. Add another thorough rinse-out before I dump about a gallon of Star San into the keg. Finally, I'll pressurize it and let the keg sit until filling it up again one last time. If the o-rings aren't damaged, I keep them on, and I never do anything with the posts. My question is this: how often should I be completely breaking-down my corny kegs?

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2 answers

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The build-up could be beer stone and if it is you'll need an acid to remove it.  If you can find BS remover, acid 5, or acid line cleaner they will all work at removing it.  
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Every brewer/brewery is different. Most prefer to break a keg down completely every time it's kicked and let everything soak in a hot Oxy-based solution before rinsing, purging and pressurizing the keg so it's ready to go when they need it. 

A dip tube brush is also helpful to get posts clean. Some brewers break down their kegs every other time - or every 3 fills or so. It depends on how many kegs you're using and how frequently all, or several, of those kegs are being used at any given point in time.
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