I just run starsan through most of the time when a keg kicks. mix starsan in a keg, hook up keg to CO2 and tap and open up tap. Every few kegs, I will run PBW through, then hot water, then starsan. Once a year, I replace the beer lines and completely disassemble and clean my taps. I've never had a problem yet.
I take that back, I did have an aftertaste on all of my beers for a period of time and could not figure out what it was. I assumed chloramine which my water company just started using. I added 1/2 a Camden tablet t my mash/sparge water, but the flavor was still there. I finally figured out it was the beer tap brushes I would religiously put in the taps after each use. I dipped them in starsan and stuck into the taps thinking they would prevent anything from growing in the tap. One night I forgot to put them back in the tap. The next night, I poured a beer and the flavor was gone. Since then, I never put the brushes in the taps and have never tasted the off flavor again.
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