I go from one side of this to the other...I've used certain APCs for nearly everything (with various dilutions) and I also enjoy using specific (and sometimes boutique) products for certain jobs. Those don't always do a better job, but I simply *like* them better. I bet I'd do differently if I were doing this to turn a profit or otherwise being more cost-conscious, but I'll admit that if I simply *like* using some stuff then I don't mind paying for it.
Don't anybody take this as an :argue but I'm curious about using APCs for tires. I've used a *scad* of different products on tires over the years, I bet I've tried dozens. But *nothing* works as well for me as Griot's Rubber Cleaner or, for tricky ones that have odd issues, Griot's Rubber Prep. Even other companies' rubber cleaners don't work as well. I'm not crazy about spending that kind of money on tires, but my APCs/wheel cleaners/degreasers either don't get them truly clean or else leave them dried out/gray looking; they just don't turn out rich and black looking. On tires I don't dress this is a serious problem, and even on ones I do dress I don't think it's a good sign.
So what are people using to clean tires? Something that leaves them looking like brand-new rubber...
Another one I simply have to spend on is Glass Cleaner. A few work like miracles but 99% of them just don't work as well for me. And I've tried all the home-brew routes too...some of those work well enough for the windows on my house, but not for autoglass. Somebody once said that Griot's Glass Cleaner is nothing but IPA, but a side-by-side test gave very different results :nixweiss Newspapers used to work well before they changed both autoglass and the paper/ink...messy though. MFs with just water? Not even close to acceptable.
Again, I don't want this to come across wrong. This is an area where I don't mind spending money if it makes the job (chore, actually..

) of detailing more enjoyable for me. For me it's not a business, or a hobby, it's just something that I need to do and making it more enjoyable is worth some bucks to me. But I can certainly understand people *not* wanting to spend unnecessary money too.
Heh heh, a good analogy might be using Hoppes #9 and ClenzOil just because I like how they smell, even though I could do the same job cheaper with something else. Now if they didn't work well, that'd be different...