A sticky accelerator linkage is not necessairly linked to a dirty
throttle plate. Honda dealers have had a big push on selling a 3M
throttle body cleaner for several years - the tech who tried to sell me
the treatment could hardly keep a straight face when he tried to tell
me my engine needed cleaning. They get a pretty good spiff for selling
this "treatment".

Techron supposedly is very good for cleaning injectors. Maybe your
linkage could use a shot of a aerosol lubricant like tri flow.