how to wash a mattress topper

{"title":"Removeable Memory Foam Lash Bed Topper Mattress 180*60*7.5cm","imgUrl":"https:\/\/img.chinax.com\/nimg\/c1\/74\/d6422b0ceba7f5e4bed781c07c89-200x200-1.jpg","attrs":{"Brand Name":"Union-win","Model Number":"BD-220711010-1 M7.5","Minimum Order Quantity":"50pcs","Delivery Time":"15 - 20 Working days","Certification":"CertiPur-100,ISO9001","Place of Origin":"China","Payment Terms":"T\/T","Supply Ability":"50pcs - 100pcs : 15-20 working days , 100pcs - 200pcs : 20 - 25 working days , \u2265 500pcs : Please contact the seller","Packaging Details":"Vacuum compress and roll up","Color":"White,Black","Filling":"Memory foam","Cover":"Knitted fabric","Size":"180*60*7.5cm","Model":"BD-220711010-1 M7.5","Brand":"Union - win","Payment":"Paypal,T\/T"}}

{"title":"74cm 240G Duck And Goose Feather Pillows Cotton Home Textiles","imgUrl":"https:\/\/img.chinax.com\/nimg\/44\/d1\/656e47ace0db688691f234ddef45-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"Sunshine","Model Number":"SS-DP-012","Minimum Order Quantity":"50","Delivery Time":"2 days","Certification":"Oeko-Tex Standard 100, BSCI\uff0cISO9001","Place of Origin":"Anhui","Payment Terms":"T\/T, L\/C","Supply Ability":"100000000000 pcs \/ month","Packaging Details":"PVC Bag +insert Card+carton","Item":"Goose feather down pillow","Fabric":"White 100% cotton downproof fabric","Filling":"Goose down + goose feather","Size":"48*74+5cm","Style":"Modern Attractive","Usage":"Bed Sleeping","Label":"Festival, Marine, Endless, Solid, Striped, Plant","Package":"Individual Polybag + Carton Customized Acceptable"}}