Originally Posted by ChshreCat
Personally, I'd replace them. Mold can be tenacious, nasty crap and tubing is cheap.
+1. If you really want to clean them, I'd try some hot beer line cleaner and then maybe some bleach+vinegar as recommended by the owner of 5-star chemicals. (The bleach+vinegar will act as a sanitizer and also bleach the color of the mold)
Maybe recirculate some caustic solution.
Or buy new line and call it done.