For a successful stain removal, it is important to know whether a textile is colour-fast or not. Therefore, we always recommend that a colour-fastness test be performed. For this, soak a clean, white cloth with some Stain Devils solution. Dab this cloth onto a concealed place of the textile, for example, on the inside hem of the fabric. The white cloth may not absorb the colour of the fabric. The stain removal can be performed if neither the colour nor the structure of the fabric has changed, after the test area was exposed to the fluid, and then washed and dried.