you can use 'carb cleaner', but rather than spray it down the throttle I would just spray it on to a rag and use the same method you use now. it'll make cleaning easier, but wont really fix the problem.
the build up of crap is probably coming from the crankcase ventilation system. check or replace the 'pcv' valve(located in the valve cover), this may help some, or at least put off the problems associated with a bad valve. remember that the crap that's jamming the throttle flows through this valve and will likely clog or jam it's operation too.

another thing you may want to inspect is the throttle stop angle. if it's set too low it'll be easier for the crap to jam it.

fuel cleaner that's placed in the fuel tank will do you no good at all. don't bother.

worn piston / rings will cause excessive blow-by, it's residue is what's collecting on the throttle plate.


see here : http://got.net/~danj/cust/hondathrot.pdf 663KB