Under the slavic (russian) practice there are two visible 'washing of hands' moments in the hierarchical liturgy: the first prior to the entrance with the Gospel (usually performed during the 1st Antiphon; is this pure convention?) and the second during the cheruvikon.
What's the practice among the greeks and other traditions?
After the communion of the bishop his hands should be washed again? Is there any formal procedure for that?
Just to finish: I was told the subdeacon (or server) who washes the bishop's hands shall say some inaudible words (during the cheruvikon). I'm not sure about this but he would refer to the people saying 'we, faithful' or something similar. Is there any (un)written account on this?