John Calvin Commentary Leviticus 13:58

"And the garment, either the warp, or the woof, or whatsoever thing of skin it be, which thou shalt wash, if the plague be departed from them, then it shall be washed the second time, and shall be clean." — Leviticus 13:58 (ASV)

And the garment. This kind of disease, God, in his infinite clemency, has willed to be unknown to us. He has indeed subjected woolen garments and furs to the ravages of the moth, and vessels of various kinds to rust and other corruptions; in fact, has surrounded the human race with rottenness, so that everywhere our eyes might light upon the punishment of sin. But what the leprosy of garments is, remains unknown.

But its expiation under the Law admonished his ancient people that they must carefully beware of even external uncleanness, so as to cleanse themselves from all filthiness of the flesh and spirit.

It seems sufficient to me to address the substance of the matter, because it would be almost unnecessary effort to dwell on the specific words, although I would be unwilling to condemn the diligence of those who also examine these points; but it is not my purpose to act as a grammarian.