If you are searched prior to the test, bear in mind that a few bleach or Draino crystals can be concealed under the fingernails. Be warned that Draino, Bleach, and vinegar change the pH outside the normal body range, and this can be detected if pH is tested. Niacin and Golden Seal Tea have shown to work on occasion. Golden Seal turns the specimen brown, and some labs are reportedly testing for Golden Seal. Liquid soap, or a teaspoon of salt will test negative, but these crude methods are detectable.
Soap makes the specimen cloudy.
Table salt puts the density out of normal range. Visine supposedly works the best among household products. They can only su ct that you used Visine due to inability of the sample to foam. Visine is a false negative on the EMIT1 tests for benzodiazepines and marijuana. Gender and approximate age of the sample can be detected, so take care when choosing a urine donor.