Listerine mouthwash has been shown to kill viruses (mostly due to the alcohol content) as will ISP rubbing alcohol. (See last half of this comment for actual scientific proof).

I recommend you do this before any PCR test and also if you've been exposed to the virus:

~ Gargle with Listerine, and;

~ Blow your nose well and then, use Q-tips dipped in a capful of 50% ISP rubbing alcohol and swab the insides of your nose. Use a hand mirror to make sure everything is cleaned up. Reach as far back with the wet Q-tip as you can. The Listerine gargle and the nostril clean up will remove and kill any microbes that may cause you test positive.

~ Real Life example: For the past two years, my daughter and her co-workers have been required to test 1x or 2x per week by their employer (the bastards) and she does the above each time prior and has NEVER tested positive. She may be in fact the only one in her office that has consistently been negative.

ADDITIONALLY, she has faithfully been on the weekly Ivermectin + Quercetin, Zinc, D3, NAC, Vit C, etc., protocol for at least 16 months.

Side benefit - wiping the insides of yours nostril with 50% rubbing alcohol, sterile saline, or even just distilled water feels really nice and seems to benefit the nose.

HERE IS THE DATA ON ALCOHOL KILLING THE VIRUS:

In March 2020, a Japanese scientist named Tsumoru Shintake who is a Professor in Physics at OIST Graduate University in Okinawa, Japan came up with a solution to kill CV-19. (I saved his 12-page report). In it he said:

"Viruses such as SARS-CoV-2 and Influenza are lipophilic, enveloped viruses, and are relatively easy to inactivate by exposure to alcohols."

"Alcohol for disinfection (rubbing alcohol in US, Surgical spirit B.P.) has been well established to sterilize various bacterias and disinfect viruses. Alcohols target the bacterial cell envelope, with resultant lysis of the cell and release of the cellular content. Also, it is well established that lipophilic, enveloped viruses are easier to deactivate by alcohols than the non-enveloped viruses.."

He also suggested that:

"... it may be possible to use alcoholic beverages of 16~20 v/v% concentration for this disinfection process, such as Whisky (1:1 hot water dilution) or Japanese Sake, because they are readily available and safe (non-toxic). By inhaling the alcohol vapor at 50~60°C (122~140°F) through the nose for one or two minutes, it will condense on surfaces inside the respiratory tract; mainly in the nasal cavity. "

TLDR Translation:

He tested many flu-type viruses including the most virulent and found that simply using a spray bottle full of rubbing alcohol to spray in the air around yourself (it evaporates quickly) will kill the airborne virus. And if you inhale the alcohol vapor, it will help kill whatever is in your respiratory tract, and if you spray into your clean mask, you'd eliminate any viral particles on it in under 60 seconds.

Here is the name of his published report:

Possibility of Disinfection of SARS-CoV-2 (COVID-19) in Human Respiratory Tract by Controlled Ethanol Vapor Inhalation