WE HAVE TO DECIDE ON A SUITABLE CLEANING SYSTEM TO REMOVE CONTAMINANTS OF PARTS THAT ARE ASSEMBLED ONTO ARMATURE AND BRUSH BOX ASSEMBLY WHICH CONSISTS OF MATERIAL LIKE PPS,SS,COPPER,STEEL.CAN ANYBODY RECOMMEND A SUITABLE MEDIA OTHER THAN TRI CHLORO ETHYLENE WHICH HAS BEEN BANNED NOW TO HAVE EFFECTIVE REMOVAL OF CONTAMINANTS .