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I buy the brake cleaner by the case. And I've found it works about as well as carb cleaner. So, I use it for everything. Prep for painting with a rattle can or powder coating. Carbs. Brakes. Engines during assembly. You name it.
If you have to buy it and are cleaning a carb I'd get carb cleaner. Two cans thereof as you are going to want to use it to both clean the carb's exterior as well as shoot it through every passage to ensure it is clean. HOWEVER, make for sure that the hole you are sticking the straw in is not a blind one. Or, you may be blind. Trust me, that stuff HURTS when it gets in your eyes. I highly recommend wearing safety glasses when you do that.
It has been many years since I did it, but I'll never forget it. Man, it hurt! I was afraid to open my eyes. But, in the end that was the whitest my eye has ever been. It really took any red out - sorta like some eye drops advertise. But, I don't recommend that approach.
Anyway, glad to help. By the way, when reassembling a Holley that has the transfer tube between the bowls, make sure you lube the o-rings. If you don't the o-ring will try to roll on the tube instead of slip in the bore of the bowl, and when it gets to the land on the tube and tries to roll over that it'll get pinched and cut. Then you have a leak and have to take the carb apart again.
Some cleaners are not safe for rubber parts; read the labels.
Indeed. I swear by brake parts cleaner, but I've found is the best if you're cleaning metal parts. Throw rubber in there, and you're much better off with carb cleaner- It's safe for the rubber seals, gaskets and such.