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Open the grills and use a long stem tipped with cloth dipped in kerosene to lightly clean the dust. Then use a similar arrangement of dry cloth wound on it to wipe clean the moist dirt. Repeat the process and you will have a clean blade. Use a jet air blower to assist you , use face mask and do it out in the open.
first open your cpu cover carefully ,by opening the screws once your cpu cover is opened then carefully remove the wire of the fan connected to the motherboad then open the screws of the fan and clean it then do the same just connect your fan to the motherboad and screw it up and its over make sure that your fan is working and its over