One of the most popular items for effects work liquid latex is inexpensive but effective for many usese. Mix with various textured items and layer the latex to form any number of looks. Also useful as a temporary adhesive.
Ben Nye's great new remover takes off all cream and oil based make ups including heavy clown bases. Also removes spirit gum, Prosthetic adhesive and some medical adhesives. Gentle and efficient it is a must have item for all serious make up artists. Wash off with soap and water.