In the thead "Mystery image" it has been proposed that the cause of the strange pattern found on some negatives may have been caused by photo flo carried over from poorly washed developing reels. I have wondered about this as I sometimes don't wash off the reels. Is this a probable or even a possible problem?

I have also read threads wherein someone presoaks with photoflo or one person who even adds a dash of photoflo to the developer to even out developer. It has also been said that the reason Ilford recommends not presoaking (which I do even with Ilford film) is that the backing or emulsion has a little wetting agent included that gets washed away by presoaking.

So whats the consensus opinion?