From the same link
How to Maintain WWB
1. Your boots will require very limited maintenance. The suppleness and the waterproof qualities are tanned right into the fibre structure of the leather. Because the leather is waterproof, it is not necessary to further treat the leather with a waterproofing treatment. The suppleness is provided by the tanning agents and will keep the leather as issued for the life of the boots.
2. When the boots are issued, they are ready to wear.
3. Should the boots become soiled or scuffed, it is recommended that you clean the boots only with a brush or damp cloth. DO NOT USE SOAPS OR DETERGENTS. After allowing leather to dry, apply a coat of black boot paste sparingly and buff lightly. Spit-shining or applying heavy coats of paste to the leather should be avoided.
Care and Maintenance of CWWG
Care and Maintenance â “ DO NOT MACHINE WASH OR DRY. Wipe with damp cloth for light soil. Hand wash with warm water and mild detergent or soap. Squeeze gently. Hang to dry. If gloves become wet, dry at room temperature. Store dry as damp conditions will cause mold, directly affecting the integrity of the materials. Minimize exposure of inside and outside of glove to DEET (insect repellent).