Ok, So Here Goes. I Will Be Honest. Using Meth
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Detailed Answer:
Hello dear, welcome to Ask a doctor's service.
I read your query and here is my advice.
I think there are very few chances of having a clean meth test in a day if you are s chronical user.
The meth urine test will show positive even after 3-5 days after stopping it.
Firstly you can try to have lots of water and fluids in order to flush it out.
Also before doing the test you can declare that you use labetalol for blood pressure or metformin for diabetes which can cause false positive tests.
Also help yourself with stopping methamphetamine and not using it anymore.
It will be a bit difficult the first week but you will get better in 3-4 weeks and will not need taking it anymore.
Using more water and keeping hydrated is very important.
Hope I have answered the question.
Let me know if I can assist you further.