cartridge demanatising

i just picked up at a thrift shop a "olsen tape demagnatiser" the unit i guess was desinged to clean or demag reel to reels but what im wondering is can i use this thing to demag my phone cartridge? i have a sumiko pearl and have been using for about a year. have never used or really know how. can i demag the cartridge with this? or should i leave it alone?