None for me either. But I use only 2 or 3 drops of Photo-Flo for 250 ml of water. Just enough to reduce the surface tension of the water. Photo-Flo uses an anti-foaming agent that contains a tallowate component which can leave a greasy residue. A periodic soaking overnight in a 2% solution of sodium carbonate helps clean any reels.
A minor detail, it helps to read the instructions and follow them.
Warning!! Handling a Hasselblad can be harmful to your financial well being!
Nothing beats a great piece of glass!
I leave the digital work for the urologists and proctologists.