I generally recommend that the wetting agent be mixed rather dilute; in the case of Photo-Flo, use a ratio of 1+400-500, which is roughly half the strength that Kodak recommmends. The same ratio is appropriate with ILFOTOL Wetting Agent. Also, use distilled water, and a fairly fresh solution. Dry at room temperature; a warm drier will cause the film to dry before the wetting agent has time to run off, which will leave the stains you are seeing.(posted 8494 days ago)David Carper ILFORD Technical Service