Remove spots using a microfiber cloth and mild soap and water or, for stubborn stains, use a solution of all-purpose non-abrasive cleaner and water, mixed according to product directions. Rinse and dry. To add a layer of protection, apply a coat of silicone-based auto wax to hard-sided luggage or a coat of Armor All to soft vinyl or molded plastic. As always, check luggage manufacturer’s care guide for specific recommendations.