If you have a general electronic supply store over there any demagnitizer will do the trick. There nothing special about Tascam cassette 4 tracks that demand any kind of special equipment. Just be sure you follow the directions on the package for the one you buy and DON'T store it anywhere near your cassettes. As a matter of fact, the top of a closet in another room is a good place for it --- cassettes are magnetic media and are erased permantly by coming into contact with magnetic fields.