Brain Bleach/Fan Works

Gaara's response to Rock Lee and Guy's student-teacher bonding in Naruto the Abridged Series: "Wow. I think I'm gonna need mind soap."
- And Team Seven when Gai came out of the scroll:

"Oh God wHy!" "My Eyes!" "Jesus Christ, somebody gouge out my eyes!"

- This is also done in Dragon Ball Abridged in response to the Eye Scream.

Vegeta: This is like looking at Freeza in the shower, Wait he's always naked....*Vegeta screams in disgust at the mental image*

One of Christine's responses to Jadis the White Witch and Darkness hooking up in this Girls Next Door comic strip.
- And this when picturing Erik as a basement dwelling Otaku

Christine:"Moon Healing Power Erase the bad mental images!!"

- From the same verse just from the Roommates side an Omake page. He saw Javert and Valjean kissing.

Erik:"...can't unsee..." *whimper*

One really funny FanFiction involves Batman, Barbara Gordon, Alfred, and Robin discovering someone had posted disturbing Joker/Batman slashfic online for everyone to read. Barbara and Dick react very badly to reading it (and no doubt the reader as well, unless they like that sort of thing):

Barbara: Someone sent me some kind of…sick…gay…porn story, starring Batman and the Joker. And now I can't get it off my screen!
Dick: Eased out of his violet pants…fingers through green hair…tight against the wet spandex…Oh GOD! 'His turgid ivory white manhood'? Jesus! I think I'm gonna be sick!

- There's some Fridge Brilliance and Fridge Horror when you remember the popular theory that the Joker raped Barbara after he crippled her. So she probably has seen what's contained in that last spoiler and in an extremely horrific context.
Often invoked to no avail in the Sailor Horus continuity of Lovehammer Inc.
A Running Gag (and theme) in Of Love and Bunnies is that Kira and her teammates find it very hard to see their mentor, Tommy, as a person, much less a person with a sex life. As such, they frequently try to unsee things they have seen. Including the entire original Power Rangers team (It Makes Sense in Context) doing the Tootsie Roll in the middle of the sidewalk.
Invoked in chapter 18 of the semi-self-insert Touhou Fanfic Average Joe in Bullet Hell, though the image in Ryan's mind was not really all that icky, unsettling, or horrific - merely of questionable healthiness.

Utsuho (referring to Nitori): She's really shy! It's so cute! You have to see it sometime!
Ryan (thoughts): Well, now you have a whole bunch of images of shy lolis running through my mind. Oh, that can not be healthy. Brain bleach, gooooooo!
*THWACK!*
Utsuho: Ah! Y-you just punched yourself!
Ryan (thoughts): Yep. Brain bleach tastes suspiciously like copper, by the way.

This alternate-universe drabble for the Tron universe.

Sam: Your parents...well, our parents...are all upstairs.
Jet: "Upstairs? but there's nothing you've got upstairs but... (Fridge Horror as Jet realizes what their parents are doing...) Get over here, Sam. You fucking owe me vodka.

Due to it's infamious nature, Cupcakes tends to appear in other fanfics as a story In-Universe, a nightmare of one of the characters, or a horror movie. Most of the time, it'll get this reaction from the characters who witnessed it in some way, shape, or form.
- In a Meta example, this fic has gained a reputation among the fandom for being used as effective Brain Bleach if one is still suffering psychological trama from reading Cupcakes.
- Another example in Once Bitten, Twice Shy. After Applejack learns...through experiment...the significance of a unicorn's horn, she sprints away from Rarity planning to scrub clean her hoof and her brain. It takes the poor girl several pages before she can look a unicorn in the face without flinching.
In The Hill of Swords, Louise has this reaction after seeing her sister acting out a sexual fantasy while calling Shirou's name.
A non-squicky version appears in Turnabout Storm. Before the trial starts, Phoenix wonders what would Edge worth do if he was in his shoes (that is, stuck in Equestria). Cue a mental image of Edgeworth gleefully playing with the ponies as we get this gem:

Edgeworth: This is just like that one episode of the Steel Samurai where he meets the Pink Princess! WHEEEEEEE!!!!
[Back to the real world]
Phoenix: (Doctor, I'd like the part of my brain responsible for that image lobotomized, please...)

In the Harry Potter/Sailor Moon/Ranma ½ crossover The Girl Who Loved, Harry happened to fall into a Jusenkyo spring shortly after Sailor Moon had drowned in it. Her spirit came out of the pool and after spotting girl-Harry and briefly thinking how hot her body looked on somebody else, she equated it to perving on your twin and wondered if ghosts could use brain bleach.
- Incidentially, Harry Potter actually has Brain Bleach, in the form of Memory Charms. Obliviate!

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