How bad are they? A can of carb cleaner should work fine. I wouldn't bother splitting the bank of carbs if they're not too bad. I'd take the diaphragm out and inspect it, take the jets out, note how many turns in there are on the idle mixture screw and take it out, leave all of the parts except the diaphragm to soak in the carb cleaner and clean the body of the carb with the carb cleaner. If the jets are blocked give them a poke with something and another spray of carb cleaner. Be careful not to damage them. You could take the choke plunger out as well if you wanted to and clean it. If you've got an air compressor use it, if you don't have one don't worry about it it's not necessary and the can of carb cleaner is pressurised anyway