nope, hair is the way they do it now, too many jock squaddies hijacking kids outside schools to get a clean sample of p!ss to present (they use a small washing up bottle with a rubber tube attached to their c0cks with elastic bands
You can get shampoo's that remove the toxins from your hair oils/follicles etc but it's only effective for about 8 hours, at what stage do they test you ? is the first one at selection ? (I have stopped smoking weed, it's just I had a pretty heavy Christmas break I'm pretty sure my blood is 90% THC still.
Ill make an unhelpfull suggestion, If your blood is 90% THC what makes you think the the posters on this site would want to advise you on a system that stops scrotes with 90% THC getting in and potentially being a security risk/problem?
Tell your recruiting staff when you last took drugs, they will probably find out how long you need to be off them and arrange for a drugs test after that point. You are joining an organisation that requires self discipline, well done on showing how much of that you have.