Hand wash in warm water using a mild detergent or soap, be sure to rinse thoroughly and dry flat.
On occasion, there can be tiny imperfections found in the metallic paper they are minor and do not affect the strength of the paper.
It is normal for the metallic paper to crease and mark with wear; the intention is for the paper to become more like a foil. This is characteristic of the metallic paper; it is not a fault.

Washable Paper and Leather details