One sort of odd thing, and this may just have been something I did incorrectly....
HydrX 'fogged' or clouded my tubing. I tried with both Clearflex60 and with Tygon. The buildup wasnt tremendous but it did detract from the 'clean' appearance of my WCing setup. I eventually went with a 10% Prestone Low-Tox/90% Distilled water + 2 teaspoons of Iodine as someone suggested in one of the threads. Zero fogging since the changeover.
Nice side note- If that happens to you and you want to clean the tubing using a shotgun cleaning rod actually works quite well to scrub it off