On focus I had a really BAD sticking throttle. Like you coudln't pass the opening and then you would be at 3/4 already. Took it down (nothing major there) and used 3M carburettor cleaner. Sprayed in and with some rags cleamed everything. Repeated few times and it was perfect.
On plus note: focus uses plastic TB which is sensitive to some cleaners so had to take extra care; puma uses aluminum so the choice of useable cleaners is greater. Carburettor cleaner is also a lubricant (similar to WD40) so when finished, spray once more and let it dry. That will leave a lubricating film