1st thing to do...replace all the belts...my timing belt putus when i bought a old secondhand car..expensive experience..straight RM600 fly cz almost all valve bengkok.....  

WRONG , that only work for proton cars.
if you do that to honda engine you just ruin your TB .

honda TB got a small motor/gear inside the TB component , if you spray with carb cleaner those carbon deposit will go in side to the motor and your idle will be ruin .
you suppose take off the motor 1st before you spray (green/black color one behind the TB)
and then the motor inside got plastic gear clean those with carb cleaner also then dont forget to p lubricated the gear.

unless your shop got help mod/tuned engine rarely you see one in your shop.......
rarely see a owner will untouch the engine ......

Guess now i need to find some reputable honda service mechanic.
Thanks for the infos guys.

Anyway, since a poster mentioned that flushing brake/clutch fluid is a tedious job, but we cant simply topup the fluid without knowing the oil brand currently in use right?