(CNN) Everyone knows how to seal a ballot return envelope, right? You lick it shut?

Authorities in Washington, which votes by mail-in ballot, asked residents on Twitter to please (please!) use "alternative methods" to seal ballot return envelopes, like wet sponge, cloth, heck even your pet's tongue.

Just not yours.

The appeal was accompanied by a catchy slogan: "Whether healthy or sick, please don't lick!"