In vitro study shows mouthwash component has antiviral effect against SARS-CoV2. However that is a long way away from any clinical use if ever.

Medical Mythbusting Commentary for October 7, 2022

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Source:
Mouthwashes may suppress SARS-CoV-2

Reference:
Antiviral effect of cetylpyridinium chloride in mouthwash on SARS-CoV-2