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Hello from JustAnswer.
I can find no studies that show that propylene glycol or carbamide peroxide will cause a positive test for alcohol or the primary metabolite of alcohol, EtG.
There are mouthwashes that contain alcohol that is sufficient to cause a positive urine test. Have you been using a mouthwash recently?
I had asked about mouthwashes and have not heard back. Many mouthwashes contain alcohol, so are a commonly used product that may cause a mild positive test for alcohol or it primary metabolite, EtG. In addition, many of my patients that are trying to quit smoking also have recently become more aggressive in mouth hygiene, so are more likely to be using mouthwashes.
If you have been using mouthwash, then you can check the ingredients to see if it contains alcohol.