Leviticus Chapter 13 Verse 57 - 59
57.) And if the mark is still seen in the clothing or in the threads of the material or in the leather, it is the disease coming out: the thing in which the disease is will have to be burned with fire.
58.) And the material of the clothing, or anything of skin, which has been washed, if the mark has gone out of it, let it be washed a second time and it will be clean.
59.) This is the law about the leper's disease in the thread of wool or linen material, in clothing or in anything of skin, saying how it is to be judged clean or unclean.