OK, you all have come up with names but no plots. So, I thought I'de do a "Simpson's" detailing episode outline (note to Matt Groening (sp??) - you can use this.)
Show starts with Bart and Milhouse mixing a bucket of gunk in the garage. They are searching the dusty shelves and boxes for anything remotely disgusting. The idea is to pore it in Todd and Rod Flander's new kiddy pool. The bucket is pretty heavy, and it takes both of them to carry it. As they carry it past Homer's beat-up car a bit sloshes out on the paint. Right before their eyes the car begins to return to a showroom appearance. Metal creases straighten out. Rust turns into newly painted surfaces. Chrome reattaches itself after lying in the weeds for years. Fleas jump off the nearby dog. Bart goes inside and tells Homer he washed the car and wants $5. Homer gives him the money and Bart and Milhouse head to the Quikky Mart.
Of course Homer doesn't notice but when he drives to work the next day Lenny asks when he got the new car. Homer just says "Not new - Bart washed." (Homer hasn't had a donut yet and is still not quite awake.)
Anyway, Lenny tells everybody about Bart's carwash service and soon there is a line a mile long. Since it only takes a few seconds to do each car, Bart and Milhouse are soon quite wealthy (for kids) and it isn't long before the bullys show up. The demand a piece of the action but Bart and Milhouse are out of gunk. They go back into to garage to mix some more under threat of bodily harm. Of course, the next batch doesn't work because they are missing a key ingredient. When they try the new batch it eats a hole through Homer's hood and dissolves the engine. Homer exclaims "D'oh!"
Bart, fearing for his life, consults Lisa for advice. She hypnotizes him in the garage to recreate the exact formula. Under hypnosis, Bart reaches for an empty jar of "Earl's Anti-Aging Creme." That's the missing ingredient! Searching for a source of this proves fruitless, and just before Bart is about to meet his doom at the hands of the bullys, Grampa comes out in the garage looking for his "salve." Finding it all gone, Grampa starts moaning - saying it won't be long now. Lisa extracts the story of Earl's Anit-Aging Creme from Grampa.
Flashback time:
It's WWI and Grampa is fighting side-by-side with a few tough soldiers in a foxhole - and Mr. Burns is cowering at the bottom of the hole. One of the guys gets shot in the backpack, and a creme oozes out and gets all over Mr. Burns face, who then utters profanities. Suddenly, Mr. Burn's face streches back into a vibrant, youthful appearance. Yes, even in 1917 Mr. Burns was old.
Burns keeps track of the guy after the war is over, and during the roaring 20's asks him for more of his magic potion. He states that he just sold the last jar to the Simpson guy, and he's out of business. It's just not right that old folks can fool the young women into marrying them or something. Burns has him killed.
End of Flashback:
About this time everybody's car begins to revert to it's former state. This is in accordance with Simpson's rule #1 - everything must revert to the intial state at the end of each episode (except when Mrs. Flanders died...) Bart gets a black eye, and Homer's car has a dissolved engine.
Sorry, this is really really stupid!
:bounce 
