I’m moving, and some rarely used items have a year-plus old film borne of the unholy union between airborne kitchen grease and household dust. What’s your favorite way to get rid of it? Items in question are not dishwasher safe, and are made of various material should: plastic, stainless steel, mixed media (a clock) so all suggestions are welcome.
409, or Castrol Purple.
Cloudy ammonia in hot water.
Windex or Magic Eraser.
Ammonia in water. If it is soakable, soak it, if not, just dampen a rag with it and wipe. Works great on those handprints around light switches and the edges of doors, too.
… Cloudy?
I second Magic Eraser. It will even remove stains on grout.
Ok, I had to google why it’s cloudy. Apparently it has a little bit of added detergent. They sell it that way here.
Zep Heavy Duty Degreaser. It’s orange - in a spray bottle. Spray whatever you’re cleaning, wait 5 - 10 minutes, wipe clean. I really can’t tell you how well this works - suffice it to say a friend of mine was floored after I turned her onto it and she drove 20 miles one way in road construction to bring me donuts to thank me. 
I’ve always had good luck with plain old 409. I’ll use a Magic Eraser and 409 for really stubborn things. The only stain that that couldn’t get out, 50 Mule Team Borax, a little tiny bit of water and the Magic Eraser worked wonders on.
Keep in mind, though, that a Magic Eraser is essentially very fine grit sand paper so you do have to be careful about damaging whatever you’re working on. I never have, but then I wouldn’t put my weight into it if I was trying to get crayon off a wall or a scuff from another car off my car. But the bottom of a cheap bathtub or sink, go to town. Glass should be fine (but I think 409 and a paper towel would also be okay). Stainless Steel I’d worry about scratching. Test it first and go with the grain.
Also, you really can’t get it out and it’s grease, trying something solvent based. One of those Orange based cleaners might work, otherwise step it up to Goo Gone or pull out the heavy artillery, WD-40.
If it’s not really soakable but can get a bit wet, put a rag or paper towel on it and then spray the Windex, or Zap, or 409 …let the damp rag or paper towel set on it for 10 minutes. Keeps the product in contact and dissolving the grease without evaporating.
Oh, you’re talking about kee-arn. The only way I know how to spell it—phonetically, but it’s an old Irish word for greasy (greezy) dirt. Anyway, I use a touch of Soft Scrub on a sponge run under hot water, then mostly squeezed out.
Love that word, Becky2844, I’ll have to remember it & use it. Thanks for the suggestions so far, everyone!