Yes, all equipment must be returned clean, and in the same condition in which you received it.  The following are exceptions to this policy:
China, Glassware, Flatware: All china, glassware, and flatware must be returned in the crates they were delivered in. Additional charges will apply if items are returned dirty. All equipment must be accounted for on pickup. Any item missing or broken will be charged to the customer. If you are unable to clean them you will be charged a fee which will be agreed upon when the items are delivered or picked up by the customer.
Linens: Please allow the linens to air-dry before you bag them, this will help avoid mildew and other damages to the fabric. Please do not launder them. Replacement costs for linens will be charged if they are returned with wax, burns, ink, gum, or mildew.