Dengsxr, I am the one that suggested a cleaner/wax. But that was only because you mentioned you needed a product right away from the store, and you implied that at some later date you would get Blackfire. So to me, a cleaner/wax and a clay job were something you could pick up at the store to use the next day. Once you clay, you wouldn't have to do it again (for a long time, anyway). Then the Cleaner/Wax would be mildly aggressive against oxidation. 3 years of neglect may be minor or major depending on where you live, if it's garaged, etc. So a cleaner/wax would give you an idea of how strong a cleaner you really need. If it does almost nothing, you need a stronger product like DACP probably. If it helps a fair amount but you think it could be better, maybe something like Swirl-Free Polish (a step milder from DACP) would work. If the cleaner/wax makes the finish look beautiful, then you probably don't need any more cleaning.
The problem with the cleaner/wax is that it leaves a carnauba wax on the car. This is fine if you were going to get Blackfire in a few weeks or something. The carnauba would protect your car for a few weeks to maybe a month. Then when you are ready for the Blackfire, just strip it (it'll be weak/gone already), clean the paint (now that you have a better idea of what sort of cleaning it needs, or don't bother to clean if the cleaner/wax kicked butt), put some glaze on if you want, and apply your Blackfire. If you are going to just wait until you are ready for Blackfire, the cleaner/wax doesn't make much sense. You want the cleaning ability of it, or maybe something stronger, but you definitely don't want the fresh coat of carnauba it leaves. Even though they aren't great protectants, the day you apply it the carnauba will be pretty strong. Stripping it may require using a paint cleaner, which just duplicates any cleaning you used the cleaner/wax for, making the cleaner/wax a total waste of time.
I'm sorry if that wasn't more clear. And I do think the cleaner/wax is an ok idea if you haven't gotten together all the stuff you need yet, or if you want to try out your application technique while getting a better feel for how much cleaning your paint will require (before buying a cleaner). Also, it sounded like you were just starting out. Some clay (which you'd need anyway) and a $6 cleaner/wax is cheap education about how to clean paint. Cleaner/waxes are reasonably effective cleaners, leave a decent gloss, and acceptable (for what it is) protection. Plus, they are usually fairly forgiving to use while you perfect your technique. But it won't be an effective part of a total regimen like you outlined above. I'm not saying you shouldn't go with Blackfire, or try a more complicated routine. Go for it. I never would have suggested a cleaner/wax except you stated you needed something readily available to use the next day, you would eventually put on Blackfire (which means repeating a lot of the glaze/polish process), and you were unsure about how much cleaning you'd require. Since that isn't your scenario anymore, you can ignore it if you'd like.

:wavey
EDIT: Just to be completely clear, here was my thinking. You wanted to go to the store and buy a bunch of stuff to use the next day, because you were free that day. Then later you would use Blackfire after you got it and had free time. So the way I saw it, your schedule would be:
Detailing #1:
- Clay
- Cleaner (may need to try a few)
- Polish/Glaze
- Some sort of protectant
Detailing #2 (some days/weeks later):
- Strip off previous protectant
- Polish/Glaze possible (like #7)
- Polish/Glaze like BF GEP
- BF Protectant (possibly repeat this)
So there is a fair amount of repeating steps, plus you may have to buy two or more cleaners/polishes (Like DACP and also SFP/#9) to ensure you can get the finish cleaned properly.
What I thought would be a good alternative was to save some money on products you might not use again by just buying one cheapy you may not use again (the C/W). So it would go like this:
Detailing #1:
- Clay
- Cleaner/Wax which will give you an idea of how strong a cleaner you need
Detailing #2 (some days/weeks later):
- Cleaner OR strip wax if cleaner isn't needed
- Polish/Glaze possible (like #7)
- Polish/Glaze like BF GEP
- BF Protectant (possibly repeat this)
There is less repeating, and you may not have to buy a product like DACP ($20) if you don't need it, and you also wouldn't have to buy some protectant to use after the first detailing before you get your Blackfire. Oh, you'd also have to wash the car before each of these steps, but you probably knew that.