Quote Originally Posted by StoneNYC View Post
Wait, it doesn't clean off of a tank? When I do my wash I just leave it in the Paterson tank and run it under the sink for 10 minutes, then at the end I drop a drop or two if wetting agent right into the Paterson tank and swish it around a bit before hanging it...

So, am I risking ruining my next batch of film? I've never seen any issues before...
The tensides that make up the wetting agent are extremely difficult to wash away from the tank and spools after they have been exposed to it. Almost impossible.
But whether it will ruin your next batch or not is hard to say. Only you can tell. But you do run the risk of having a lot of bubbles develop when you agitate the tank, which have the potential to stick to the film surface, especially where the film touches the reels. Sometimes you see pictures with strange looking bubbles along the edge of the prints, usually 120 film (because its rebate is really narrow), due to these bubbles.