Certainly with your past incident we sympathize with your desire to really clean everything which is going to touch your AC system...
One possibility which I have suggested for a long time which could be used in this situation is to install an inline filter... just after ( downstream flow) where you are going to connect to the system... but before any other item in the system... it could be left there.... any time a black death has occurred it is a great insurance policy..
AND remember , the FSM calls for that metal ' manifold' on the side of your R4 to be REPLACED ( renewed as they like to say) ... not cleaned... it appears that it may have some filter inside which can not be cleaned properly in case of black compressor death...
I highly recommend this guy on Youtube... he is a long time pro....and understands the big picture... his attention to detail and cleanliness is inspiring...
http://www.youtube.com/watch?v=C7FMoKVkrl4&feature=more_related