Soft textured leathers like suede and shearling lambskin are magnificent to touch and feel, unfortunately, they are also extremely difficult to clean and protect. Your best treatment for cleaning suede and soft textured leathers is a suede brush which will have short, bristled, fine wire teeth. Brush carefully and only when the leather is dry so you don't affect the nap of the leather. Stains are a challenge since you can't use any liquid cleaners without affecting the texture and possibly "matting" the finish. Try rubbing some cornmeal gently into the stain to absorb it and use your suede brush to remove it. ANY and ALL oil based treatments are inappropriate for these textured leathers since any oil-type treatment is going to affect the texture adversely. You can use a waterproofing agent if it is not a sealant (be sure to test in a discrete area first) but the inability to restore the natural oils of the leather is problematic. Your best approach to extend the life of these fabulous leathers is to use them sparingly and store them carefully and not allow them to become wet to ensure years of use.