Hey Zico,
I agree that any Capt should know it! But how many do know the exact requirements when to use de- vs anti ice, the time between de-ice and starting etc. What I mean to say is we learn an awfull lot in the ATPL days but do you recall all on the line??? If you do you are superman.. and in that case you will never ask. What I teach everybody: when in doubt only the tiniest bit: ASK!