Exotic leather types such as ostrich or alligator leather need special care. According to Montblanc, care wax is the only correct agent; moist or watery care solutions may rather damage the leather, since these leather types must have returned to them, by the wax, those natural oils and a high beeswax content that they lose over time. The wax should be applied very thinly and well massaged in, otherwise a whitish residue remains on the surface that, while not harmful, is unsightly. On crocodile leather such residues can, thanks to the smoother surface, be polished away again well with a microfibre cloth.