While Caterpillar boots are designed to withstand tough conditions, it's generally recommended to avoid machine washing them. Instead, cleaning Caterpillar boots should be done manually. Use a soft brush to remove dirt and debris, and a damp cloth with mild soap to wipe down the boots. Allow them to air dry naturally, away from direct heat sources. Following the care instructions provided by Caterpillar for the specific boot model is advisable to maintain their quality and longevity.