Dr. Martens Brown Combat Boots with Chunky Sole

well-loved women’s brown leather doc marten boots. due to lots of wear the size chart on the inside has been worn off, so I believe they are either a women’s size 8.5 or 9. I’m usually a size 8 and they are quite loose on me. brand new laces as the original ones were damaged. soles are quite worn, but there are no holes. quite scuffed and a bit stained but I’m not sure how to properly clean leather, if you know how then I’m sure you could get them looking great!