If one is using the double transfer method, no clearing bath is needed. With the single transfer method, a clearing bath is recommended as some dichromate can be trapped between the gelatin and the final support during transfer. I use Potassium alum right after the cooling bath (after the transfer). It has been found that any dichromate left behind slowly hardens the gelatin and increases its brittleness over a lot of time (your descendents will have to deal with it -- not you. But no problem, really, if one keeps the prints flat.