Or go ahead and buy The Liquid Stuff or Q-Carbo. From my brother-in-law who smokes way more than I do:

So my friend who has to take random tests all the time and smokes all the time says that he keeps a bottle [of Liquid Stuff] in his glove compartment and drinks it on the way over to the testing place and it's worked every time; who knows how they do it for you place, but the effect only lasts for a few hours, and if you don't know when you'll have to do it, it might be better to drink one for the interview, and have one handy in case you need to drink one elsewhere.

There is an agenda here against cleanse products (because it's perceived that they fund the war against drugs or something and it's better to be a hippy about it), but here's some additional info.

BTW it's just b/c you said money wasn't an issue. These cleanse products can be bought at a GNC or Vitamin Shoppe and Q-Carbo specifically worked for me after being clean for 2 weeks.