I have a bag that I have loved for many years but have stopped wearing it a long time ago. It is quite dirty in some places, mostly the strap, (not stains, more just dirt from wear) and the leather looks and feels very dry. It's lined with a thin foam padding in between the top leather and the leather lining. Does anyone have an idea how to clean/wash and protect the leather on this bag so that it's soft again? What products should I use?