Regular grooming with a comb, plucking out lose hair with your fingers and regular hand grooming - spray water on your hands and rub them up and down the coat - this will get out any loose hair left after you've combed him. This will probably need doing daily. And if he is a NZW then he will have an extremely thick dense coat so is likely to be moulting for a while!!
Oh BTW - its moulting not malting