Clean leather

Even though you’re supposedly allowed to put suede into the washing machine we wouldn’t recommend it. Preferably try brushing it with a leather brush which removes skin deep stains and looses the material.
If there are especially dirty areas brush them particularly carefully. In case of necessity you could always buy some special suede cleaning products such as a velour stone. Or you invest a little money and give dry-cleaning a shot.

If you just want to disinfect the lining we’d recommend a steamer.

Use dubbin in order to treat your nappa leather — you could also find vegan, plant-based ones. The fat will make your leather smooth and shiny.