Fun post -- mine would be:

Krud Kutter - Used in my ultra-sonic cleaner and also for cleaning down filthy cabinet exteriors
91% Alcohol - Playfield cleaning and also selective part cleaning
Novus 2 - Playfield cleaning
Auto Polishing Compound by Turtlewax - For the "Sharpie" touch-up method taught to me by TimME
Meguair's #26 Mirror Finish Wax - Playfield Waxing
Bondo - Small cabinet fixes before repainting
WD-40 - Used extremely sparingly
Engineered Oil - A drop now and then on metal-to-metal Stepper Unit parts
Wood Glue - Cabinet Repairs
Windex - Keep that playfield glass spotless! (and occasionally clean outside of back-glass too)
Brush Cleaner / Mineral Spirits - Cleaning paint brushes
Evapo-Rust - Evaporating Rust!
Citrus-Strip - Paint stripper for re-theming cabinets
Lacquer Thinner - Used for my first webbing earlier this year (and future ones too!)
Gorilla Glue - Multiple Uses
Super Lube - Score Reels, Steppers, AS Relays, etc.
Mother's Metal Polish - Used to hand-polish all kinds of metal cabinet and playfield parts (and even chime units when I restore them)
Walnut Shell Media - Not technically a cleaner but USED as a cleaner/polish compound in my tumbler for metal parts. Works phenomenally well.
Mosquito Repellant - I'm working in Texas in a garage!

And in the mini-fridge (did I mention I'm working in a hot garage in Texas?): Beer, Soda and Water!

Oops, duplicated my post...

LOL, Clay will be along shortly to kill Ken over the "Millwax" mistake.

Mine are fairly close to Ken's.

I haven't used my big bottle of Millwax on a playfield in years but I find it works really well at cleaning rubber. It's been with me forever, almost since I started collecting. Years ago I read the bottle would shatter if dropped. It finally met it's fate. I beat the odds for so long but it happened. Fortunately there wasn't a ton of it left when it went.

I acquired a big bottle of Wildcat from an old pinball friend. I wonder if it is a similar product?

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I'm a big fan of mineral spirits as a good general degreaser and degunkifier for steppers and other metal parts. Use it on a cotton swap or old toothbrush or rag to dissolve and wipe away old grease and grime. Or flood hard to reach places like switch stacks or stepper arm joints that don't come apart (a little dental floss helps with those too). It evaporates slowly so you get plenty of working time. I keep it in an old spray bottle so it's easy to dispense too.

/Mark

These are helpful posts, and thanks for starting the thread, Ken!

I would like to add creamy peanut butter to the cleaner list.

Someone had posted in another thread regarding its use for removing sticker residue from aprons/arches (thank you to whoever made that post!).

I used peanut butter with a single edge razor blade to carefully remove residue from two aprons and it worked very well (and the effort didn't remove the underlying paint/webbing).

Nice helpful posts to a useful thread.

The list here is long, over the years lots have come and gone.

Ultimately kerosene, old formula (bought a bunch) of goof off, 91%, and 99% iso, windex, car-nu-be, #1/2 and occasionally #3, *WATER*, denatured *WATER*, mean green (the old stuff, the new stuff is different and not as effective), a thin spit, turtle wax green bottle, Break Free from Wallyworld, elbow grease (its a solvent by most quality standards). Buying games that don't need all this chemical garbage to make them work, play and look great. Life is short, spending each additional fraction at this game of games, well it gets older and older as one gets older and older.

I like liquid Barkeepers friend to clean play fields. I have never heard a peep from any others who might use it, so guess I'm alone.