Leather must be wiped weekly to remove Human perspiration which can damage the finish. Wipe the areas with a damp cloth.
Denim and other rough materials can be very abrasive, and the dye can also leak out and stain light coloured leather.
Sunlight can fade leather and other fabrics. Keep chairs out of direct sunlight and draw the curtains on sunny days. Also, excessive heat can cause damage if placed too close to a hot radiator.