When you sculpt there will be lumps and bumps and finger prints and all kinds of irritating irregularities in your work.
There are three methods for getting rid of them and each has it merits.
Using a small soft brush you can either dip in
Baby oil: Takes a lot of work but does smooth the clay down
Vaseline: I like to use this when I have a small little area that needs fixing.
Rubbing alcohol: this is my favorite, it works fast removing lumps and bumps but if you aren’t careful you can go too far.