I believe I have read somewhere I cannot recall, but it was a reputable source... If you selenium tone after washing, it must be a thorough archival-style washing. If you tone after fixing, then go straight from fixer to toner with no rinse whatsoever. Otherwise, staining. Wish I could remember where I saw that, but I do remember it was some book of trustworthy repute.
Side note. Seems almost a pity and a shame to go through an archival wash, just to contaminate the print and have to do it all over again.