DOSAGE AND INSTRUCTIONS FOR APPLICATION Remove the hair from the region that will be treated with CAUSTICO ROJO CHINFIELD. 3 to 5 minutes of rubbing with a brush Wait 24 hours to see how it affects you, then repeat the procedure if necessary. To avoid caustic bleeding, it’s best to wrap the injured region in petroleum jelly. Wash with warm water and soap after 5 or 6 days. Disinfect and keep the area clean until the peeling is complete.