drug test throw off?

i have been clean for about 3 weeks...and im getting tested soon...so im not sure if it is outa me..so i am going to put some bleech in to make sure i am clean..can this throw off the drug test and make it a positive test when i am really clean?..and are there other ways i can make sure i am clean so i dont have to do this.?

It can be an automatic fail for failing the pH test, meaning they'd know you fucked with it and you are hiding something.

Don't use bleach.

3 weeks sounds good. I tested clean after 18 days, I have a fast metabolism and shit though.

You can always dilute if you wanna be safe.