Propylene Glycol is the the effective ingredient in Zydot as well.

You are at the borderline stage. You might test clean now depending on how long your hair is, how fast it grows, and what your prior use levels were.

A bleach and redye would almost make your chances of passing almost 100%.

Depending on your hair type and usage, you might pass after a couple of Mac treatments, with the last one being the day of the test followed by Zydot.

Were you a chronic or a light user before you quit?