Remove dust with a brush that has no traces of polish.
Wash the leather with a clean sponge dampened with water.
For persistent stains, start again using shampoo or a neutral household soap then rinse with clear water. Clean both shoes in their entirety; cleaning only the dirty parts can lead to variations in colour. In case of oily marks, rinse out as quickly as possible.
Leave to dry on shoe trees away from direct heat.
Once the leather is dry, brush in the direction of the fibres with a crepe brush.
Remember to apply a light coat of colourless waterproofing spray regularly; once round the shoe at a distance of 20 cm is sufficient.
Press the spray button once before treating the leather in order to avoid spraying large droplets on the leather as they can leave marks.
Leave to dry, always on shoe trees.
Be especially careful when working with Cachemire which is a fine, delicate leather.