How long does weed stay in your saliva if u use mouthwash for 3 days straight ?

Mouthwash no help: Mouthwash does not take weed out of the saliva. Saliva is a fluid that is produced in the various salivary glands.

Your problem:: I have heard that you may get a positive test for weed with saliva testing from 3-15 days afterwards depending upon your usage and the sensitivity of the testing. Mouthwash will have no effect on the length of time required. If this is job-related, consider not using this substance at all as you never know when you might be required to be tested in the future. Don't use it & then not an issue.

Already gone!: Marijuana has an active ingredient called thc, which enters the bloodstream rapidly, but is metabolized relatively quickly, usually within a few hours. However, some of its metabolites are detectable in urine for up to 13 days after smoking a 'joint'.