I replace my tubing when I can not stand it's looks although I have never had any beer that tasted bad in the past 40 years so I think that if you wash it in very hot PBW and then rinse well and then a short soak Starsan just before use that it will not have any critters in it to hurt your beer. Starsan is an acid and can not be beat for effectivness.
Fermentor 1: Bill's House Ale II, Fermentor 2: German Helles, Fermentor 3: Bill's Schworzbier (Black Bier)
Tap 1: Bill's House Ale II, Tap 2: German Hefewizen, Tap 3: Nut Brown Ale
Future Brews: Stone IPA Clone, Blonde Ale, Budvar Clone, Newcastle Clone
New toy: Blichmann 27 gallon fermentor
If you find yourself in a hole, the first thing to do is stop digging
Good judgment comes from experience, and a lotta that comes from bad judgment