It's a known fact that it's easier to clean things off when they're wet, be it with water, or some kind of other cleaning agent. However, there are times where something must be cleaned, but they don't have access to any sort of cleaning agent. That, or the character just doesn't find reaching for one necessary, knowing that they actually always have a liquid conveniently at hand to use -- their own saliva.

This trope might manifest in a character using their saliva to scrub a table or counter until it shines, or to wipe unsightly dirt off someone's face. Doing this may be seen as pretty [[{{Squick}} squicky]] to some, but it can still get the job done all the same.
[[folder:Film - Animated]]
* Mushu tries shining up Disney/{{Mulan}}'s armor to cheer her out of her HeroicBSOD. It doesn't work.
* On ''WesternAnimation/{{Cars}}'', Mater offers to clean off a spot of tar on Lighting [=McQueen's=] hood, and he starts hocking before [=McQueen=] hastily declines.
[[folder:Film - Live Action]]
* Some servants do it with the ''royal crown'' in ''Film/TheMadnessOfKingGeorge''.
* ''Film/SpaceJam'': The WesternAnimation/LooneyTunes gang cleans their gym this way.
* Ragetti does this with his wooden eye a couple times in ''Franchise/PiratesOfTheCaribbean''. Later on, Barbossa gives the thing a ''really'' good slurp and shoves it back into Ragetti's empty socket. The poor man looks terrified.
* Blaze and King Charles II have a bonding moment spitting to shine their leather boots in the French comedy ''{{Film/Delusions of Grandeur}}''.

[[folder:Live Action TV]]
* Jayne of ''{{Series/Firefly}}'' does this with a knife, combining this with LickingTheBlade. This...disconcerts the rest of the crew.
* ''Series/TheBigBangTheory'': Raj uses his spit to clean off dirt from the crotch area of an Comicbook/{{Aquaman}} action figure bought in a garage sale.
* On an episode of ''Series/{{Seinfeld}}'', where George is forced to be a butler for his parents, Frank orders George to shine his shoes, and George spits on the shoe once Frank's back is turned.

* In ''Theatre/AVeryPotterSequel'', Neville begins spit shining Harry's shoes while Dean gives Harry a massage. Ron quickly chases them off and then takes over both duties, [[RuleOfFunny spit shining Harry's back]].

[[folder:Video Games]]
* The bartender in ''VideoGame/MonkeyIsland2LeChucksRevenge'' used his spit to clean the glasses.

[[folder:Western Animation]]
* Done by Hank when he must shine his father's shoes as punishment on an episode of ''WesternAnimation/TheVentureBrothers''.

[[folder:Real Life]]
* Works on shoes.