I don't. Actually, in both linen closets we have the metal shelving. I liked the idea for air flow around fabrics. But we do have wood shelving in other areas and I don't line them. They are smooth, stained wood and all I need to do is wipe/dust them . In areas where I have cleaners, liquids, etc. I have large plastic bins - or in a couple of cabinets - the pullout baskets - so no need for lining.

Can you tell I'm not a fan of shelf liners? Honestly to me, it's just something else that will (soon or later) need to be replaced. Just my 2 cents worth!