Does a drop of bleach clean your urine of marijuana?

No, that is just a myth.

Bleach and most other things don't typically work. Some people flush out with water (this can normally be detected). Some people eat a bunch of Gelatin (to coat the stomach). There are other products you can buy that will SUPPOSEDLY give you a clean screen. However, most screens are designed to know if the person has flushed or not. If you test for "nothing " that is usually odd because most people will either test for caffeine/nicotine or "something".

Honestly, urinalysis tests are on their way out. Hair samples are used instead because they can detect some drugs for up to six months after their use. (Or longer)

Of course the best advice I can give you is simply:

If you need the job, don't do the drugs. It will be better for everyone.

Good luck.