please consider the proper burnishing of clutch before moving on to other remedies related to clutch, as mentioned by Guru in post above...u can do some research online for the process...
regarding cleaning injector, the liquids available off the shelf claiming injector cleaning do little good rather do more harm by contaminating the fuel system.
please consider the ultrasonic cleaning and pattern checking for injectors, better option is replace with correct part, our desi ustaads also try cleaning then using pressurized carb cleaner and giving pulse to injectors manually, sometimes it dislodged the particles stuck but still its not a reliable method...
sudden lowering of idle rpm may also suggest some electrical issue ( coils or plugs ) or the IACV getting stuck at some point, please check that as its an easy fix