• Starwax The Fabulous Sorrel Salt is ideal for whitening and removing rust from textiles, leather, and wood. • Oxalic acid restores whiteness to textiles and removes rust from wood and leather. • In the home, it removes rust from plastics with a sponge. • Effective for removing the gray tone from wood with a sponge, brush, or sprayer. • For clothing, it removes rust stains by rubbing the solution in water with a sponge. • Dissolve 4 tablespoons of sorrel salt in 1 liter of cold water to apply on surfaces. • Let it act for 10 to 15 minutes and rinse with plenty of clean water. • Allow to dry before applying new protection.