I totally agree with Bat.man, as a Captain I can hardly ask the cabin crew to clean the aircraft if I am not prepared to lend a hand myself and to be perfectly honest I actually enjoy helping out.
A. I get out of the cockpit.
B. I get a chance to chat the cabin crew and remember we are part of a team just like the good old days.
C. It encourages good crm and the breaking down of the them and us feeling, especially since Mr Bin Liner has caused all flight deck doors to be locked.