I would keep diluting. I drink a lot of water period, so it's not uncommon for my urine to be clearish. I've smoked heavily, including the day before a test, and passed. Diuretics before the test really help. I drink about a pot of hot coffee, and drink a few 20oz waters (warm if possible) RIGHT before the test. It should run through your system very quickly. If you can put off the possibility of a positive test by continuing to dilute it, then you should. As far as I'm concerned, Diluted is ALWAYS better than positive.