Okay, so I did the first full treatment of TW tonight. I don't know if anyone else has had this issue, but the stuff does not wash out very easily - says to rinse with 2-3 gallons of distilled water, took A LOT more than that and I'm not sure if it's even all out. Anyway, plan is to do one last full treatment Friday right before I go take the test. I'll keep you posted on how it goes. Thanks for all your help!