At first, I would use a toothbrush and sponge, but now I tend to use a knife which gives me more possibilities with the materials I choose to work whith : polystyrene, plaster, iron, gel, wood, fabric, paper (cellophane, X rays) and recently hair.

At present I'm giving up a lot of my time to using hair. I have displayed my work several exhibitions.
Hair is a very interesting medium to work with mixed with plaster and paint it gives surprising and original results.