There's a little prayer I say everytime I have a little left on the plate after I'm done cleaning -so theres a little dust
and I say:

Pot Got, Pot God,
take it away,
bring it again,
another day!
(Then I blow away the dust and)
say Amen.

Some of my buddies are always out and they don't say the prayer so I'm convinced it works.

I have been smoking grass for 18 years and rarely (well there was that one time the DEA took a pound) have I been out.