Non disponible Rénovateurs Gelcoat / Métaux Oxalic acid / Sorrel salt - 400g CIROXALIC400G €13.79 Oxalic acid / Sorrel salt - 400g Oxalic acid, also known as sorrel salt, cleans metals and old wood. Dissolve 200g oxalic acid per litre in hot water. Wearing gloves, apply the product to the wood using a nylon brush or sponge. Leave for around 2 hours. Rinse thoroughly with clean water and leave to dry for 24 hours. Add to basket Made in France