What do you guys use to Clean PCB soldering ? cause i can't get the ROSIN off the PCB's boards what do you guys use? I have used MEK with a acid brush to remove the ROSIN off the PCB if this ok or right? What else can i use please? HOw do you guys clean dirtry IC chip pins that are very dirty ? I use a Brass Wire brush to remove the dirt off of the IC chip pins , but it bent the IC chip pins alot How can i prevent the IC chips pin from bending while cleaning? Or What do you guys use to clean dirty IC chip pins? I use steel wool after to polish up the IC chip pins is this good?