Yes, Dettol can kill fungus on clothes. Dettol has been proven to be very effective against fungi, mildew, yeast, and gram-positive or negative bacteria. Also, according to the studies carried out by agar patch, it was reported that Dettol can kill up to about 98% of microbes within 15 seconds. Although it is not the best way of getting rid of fungus from cloth. Make use of lemon and salt instead!