The sticky thread on dillution at this site should be helpful. It is a long read but worth the time for folks in your spot. Only time can remove the THC from your body as previously stated. The dillution is just for the days prior and up the day when you are tested. It is just to make sure your sample is dilluted but does not raise alarms.

There is advice for folks who need to do a hair test on this site as well.

Update the site with the results.