Wash down your boots after each use with water or water and a mild soap.

Wipe the boot with a lint free cloth. 

For regular users, it’s important to clean your boots daily and now and again.
Use a recognised rubber cleaner, ROCKFISH recommends "Grangers Rubber Boot Care", use in line with manufacturer’s instructions.

Store in a dry place, out of direct sunlight and away from sources of heat.
Always store in an upright position.