I have been wet scanning some of my medium format and 5X7 negatives, using either oil or kami mounting fluids Both substances leave some residue on the negative that must be wiped off. I would prefer to not have to wipe off my negatives for fear of scratching. Are there any liquid products in which I could safely soak my negatives to remove the residue from oil and kami fluids, thus avoiding having toi wipe them clean?