I'd mark that toothbrush _very_ clearly if I were you . Although you'd probably notice an peculiar taste fairly quicky :Sick: .Originally Posted by Ed Sukach
When I started using my Jobo for B&W recently I checked out the FAQ on their site. I saw the "Why shouldn't I use wetting agents in my tank?" question and assumed that it must have to do with foaming. Later, when I actually read the answer it mentioned the "gunking up" of the tanks, even stainless ones. Frankly, after decades of working in dozens of commercial darkrooms, I've never noticed a problem but I'm new to using plastic tanks and reels and I'd just as soon 'de-reel' my film before wetting it anyway.
I use Kodak Photoflo for the sole reason that I haven't had a problem with it so far. After hanging the film, I remove the excess by running a folded piece of photo-wipe down each side of the film. I've been happy with the lack of water marks and haven't seen any bad effects, at least for many years.