Amazon.com: True & Tidy, Extra Thick Microfiber Mop Pad Refill for SPIN-800 TrueClean Mop and Bucket System, Fits Other Square Mop Heads, 9 x 9 inches, Machine Washable up to 100x, (2-Pack) :
True & Tidy 2pc Mop Pad Replacement for SPRAY-360 Spray Mop Kit - Bed Bath & Beyond - 38057142