Can’t find it at Costco any more

Listerine is still sold a lot in Europe.

I always wash my mouth with water after using it to minimise this risk.

At first I thought this was a dumb question, but it's actually quite interesting.

Why not alcohol based hand sanitiser or working with methylated spirits.

I find it unlikely alcohol causes significant cancers from skin contact compared to running it through the body.

At minimum answering that question would help understand the risks.

[Edit] interesting claim -

"Alcohol may cause changes to cells in the mouth and throat that make it easier to absorb the cancer-causing chemicals in tobacco smoke"