Spit Shine

Characters using their own spit to shine some object.

Some examples include:
 * A restaurant worker cleaning tables.
 * A mother cleans a smudge off her child's face using her spit as the cleaning solution. Or using her spit to manage the child's hair.

Film

 * Some servants do it with the royal crown in The Madness of King George.
 * Space Jam: The Looney Tunes gang cleans their gym this way.
 * Mushu tries shining up Mulan's armor to cheer her out of her Heroic BSOD. It doesn't work.
 * On Cars, Mater offers to clean off a spot of tar on Lighting McQueen's hood, and he starts hocking before McQueen hastily declines.

Live Action TV

 * Jayne of Firefly does this with a knife, combining this with Licking the Blade. This...disconcerts the rest of the crew.
 * The Big Bang Theory: Raj uses his spit to clean off dirt from the crotch area of an Aquaman action figure bought in a garage sale.

Plays

 * In A Very Potter Sequel, Neville begins spit shining Harry's shoes while Dean gives Harry a massage. Ron quickly chases them off and then takes over both duties, spit shining Harry's back.

Video Games

 * The bartender in Monkey Island 2 used his spit to clean the glasses.

Real Life

 * Works on shoes.