Leviticus 13:54

52He shall burn the garment, whether the warp or the woof, in wool or in linen, or anything of leather, in which the plague is, for it is a destructive mildew. It shall be burned in the fire.

53“If the priest examines it, and behold, the plague hasn’t spread in the garment, either in the warp, or in the woof, or in anything of skin;

54then the priest shall command that they wash the thing that the plague is in, and he shall isolate it seven more days.

55Then the priest shall examine it, after the plague is washed; and behold, if the plague hasn’t changed its color, and the plague hasn’t spread, it is unclean; you shall burn it in the fire. It is a mildewed spot, whether the bareness is inside or outside.

56If the priest looks, and behold, the plague has faded after it is washed, then he shall tear it out of the garment, or out of the skin, or out of the warp, or out of the woof;