I just made a very simple and effective washer I saw in an old Zymurgy magazine 1994 or so...hooking a pump up two two beverage lines. Take your cleaner (your choice) with a gallon of hot water and pour into your keg. Seal and run lines opposite of the usual...in to in on the pump and out to out on the pump...turn over onto two carboy cleaner (blue) holders so the lines are free and run the pump for 10-20 minutes. This will clean anything out including the poppets, etc. Rinse in the same way and finally with a sanitizer. You are now ready to put something tasty back into the keg!