I wouldn't advise using alcohol to clean them. That is only going to dry them out - it is skin after all- and putting oil on them is only going to leave a darker finish. You can wash them, even use soap on them if you like (once again, they are just skin so you can clean those pores). If you like a bit of a suede/calf skin feel a light going over with a wire brush will *****le it nicely.
the deleted work was pr ick le , ha ha, didn't think it would be sensored. in case it is again, the wire brush will rough it up a little bit and take away the slick feel.