If you prefer the plug route, these work really well. You can get different colors to either make them more subtle or more noticeable, whichever suits your needs. When using, I usually give them a quick dip in starsan after I am done with that tap for the night. They don't work with a stout spout though, but the covers don't either. At least in my experience, the covers keep falling off stout spout, but at least they will fit unlike the plugs...
If you don't dip or somehow rinse the brush/plugs they can get a little sticky in the faucet from dried beer which can't be a good thing... and the covers will catch a drip or two...
Amazon.com: CRBrewBeer 15 Pack Beer Tap Plug Brush, Beer Faucet Brush Plugs, Beer Faucet Tap Cleaning Plug (Blue): Kitchen & Dining