The stencils are made from quality Mylar. With reasonable care, they will last for years to come.
These stencils have been designed for use with texture mediums as well as oil based and acrylic water based paints.
Use a stencil cleaner. Rinse with lukewarm water and lay flat to dry.
Never use hot water as it may distort the Mylar and render stencil useless. Do not use solvents to clean your stencils, as they may cause damage to the Mylar.