Sprinkle with Sommières earth and leave to act for about 30 minutes before brushing. The operation is repeated until complete disappearance. For an old stain, let it act overnight. Another option:soak the garment for an hour in white vinegar and lukewarm water, then machine wash.
On synthetics.
The stain is even more difficult to remove, so we switch to the textile stain remover (Starwax Textile stain remover-Biological stains and, at Rubigine, the Extreme “grass” stain remover). With a clean cloth, very carefully rub the stain from the outside to the inside. Then rinse with clear water.
On leather.
Fragile, it does not support contact with stain removers for textiles. So, we use a soft toothbrush dipped in milk and we rub gently. It is also possible to use 90° alcohol or white vinegar (to be dabbed with a cotton ball).