I like your brothers method. I sprayed mine slow, took me about 20 or so minutes, was not quick and a totaly pain but worth it. I honestly wouldn't use SeaFoam but it might be the same stuff as the CRC stuff, who knows, I was told that the CRC stuff is made for out type of DFI /turbo car.My brother in law, who is a master mechanic and who worked for Ford for many years, explained the way he'd prefer to do it. He likes the idea of spraying SeaFoam or other intake valve cleaner *VERY SLOWLY* into the intake. He recommends a rate that would spend the entire can in about 45 minutes, rather than the repeated 30-second burst method. And you'd keep the RPMs up at around 1500 for the duration. He said that if it takes you 10 minutes to empty the can, it will not do any good at all. He has used this (slow) method before and used a snap-on professional grade endoscope, and said that the valves looked like new after doing it. I don't know of a really good way to be able to regulate the flow of the can to a rate that slow, but it might be a good way to do it.
I haven't heard of this super-slow method on the forums before, and since my brother in law is a professional, I thought I'd repeat what he said here. I might still decide to pull off the manifold, though, so I can see what I'm doing.
My issue is that I haven't seen any really good guides on how to remove the manifold. I found a guide, but I didn't think it was very good. Any suggestions?
I think a good method would be to put it on a vac line that would auto feed it from under the hood and drive the car at 2k til the bottle runs out, couldn't do it with the CRC but SeaFoam would work if it is ok for the car. basically let the vac of the car pull in what is needed? idk just thinking up ideas but not sure if it is a good idea or a bomb under the hood :\
one of dozen videos on you tube. if that video doesn't help I recommend taking it to a "professional".