I agree with all said above. When reviewing Ilford's tech sheet I realized I have been exceeding the washaid working solution life of 7 days. Gosh, that is short. Well, the primary reason for the washaid in my process is to rid the print of the thiosulphate toning byproducts. With TF-4, there is no need to use a washaid. Just what is the reason for mixing washaid with selenium?