Not suitable for machine washing.
Allow any mud or dirt to dry then gently brush off. If more thorough cleaning is required, gently hand-wash with lukewarm water and either lay flat or hang to air dry in a well ventilated area. The lead may shrink and feel stiff once dry, but it will loosen up with use.
Avoid repeat and prolonged exposure to wet and damp conditions without adequate drying time in between uses. Appropriate use and care should be taken at all times to ensure lead longevity.