Mazdan- I'd sure find out from somebody who's actually used the products in question before you go that route. While I'm tempted to say how automotive stuff is pretty tough, and that most anything is really OK most of the time, you sure wouldn't want to use the wrong thing for your particular application and then regret it.
I can't help but think how sooo many people think Simple Green is perfectly OK, but now and then somebody posts how they used it and it [messed] something up in a horrible way. Wouldn't want anything like that to happen to you!
So FWIW I recently paid the bucks for a bottle of Optimum Power Clean and it worked *great*. Ditto for my old bottle of potent wheel cleaner (my guess is that it's similar to Meg's Wheel Brightener only less potent), which I hardly ever use but do like on the rare occasions when I need it. My point being that buying the good/expensive stuff for those rare tough jobs can be a good way to go if you can swing the expense. Since you only have to do such jobs once in a blue moon (for me, it's once when I buy something) and then you're just maintaining, the amount of expensive/potent product that you'll need shouldn't be all that much.
