Not sure about that product specifically, but I believe a good way to pass is drink plenty of water 1-2 hours before the test, and a vitamin b tablet (for colour). When you start the test piss in the dunny for the first part of your piss then the "middle section" into a cup, and the "end" back in the crapper. I would imagine that Mega Clean could/would be used several hours before the test... Hope this helps
CHRON
CHRON