Wash dirty shoelaces separately: mild soap and air drying
You can freshen shoelaces without machine-washing the shoes. Nike recommends removing laces, using a mild cleaning solution, rinsing, and air-drying.
Nike's shoe-care guidance recommends washing removed laces with a diluted mild solution; mesh-bag machine washing may be an option for suitable laces, but heat can deform their plastic tips. The shoe upper and insole require separate, material-specific care.