54 the priest will order the contaminated object to be washed and then isolated for seven more days.
55 Then the priest must inspect the object again. If he sees that the affected area has not changed appearance after being washed, even if it did not spread, the object is defiled. It must be completely burned up, whether it is contaminated on the inside or outside.
56 But if the priest sees that the affected area has faded after being washed, he is to cut the spot from the clothing, the fabric, or the leather.
57 If the spot reappears at a later time, however, the mildew is clearly spreading, and the contaminated object must be burned up.
58 But if the spot disappears after the object is washed, it must be washed again; then it will be ceremonially clean.
59 "These are the instructions for dealing with infectious mildew in woolen or linen clothing or fabric, or in anything made of leather. This is how the priest will determine whether these things are ceremonially clean or unclean."
Read Leviticus 14