You have 4 leather options in G20.
Vernasca and Merino (BMW Individual option) are for seats and door panels
Walknappa (Nappa leather) on M sport and BMW Individual steering wheel
One more type (i don't know which type) on normal and Sport steering wheel.
Sensatec is BMW name for material which is close to leather, so fake material. It is not leather.
On mine G20 i have Walknappa on stereng wheel, Vernasca on seats and Sensatec on dashboard. I clean everything with water and BMW UV leather protection. It seems to be good for Sensatec too
