Once a person has been exposed, there are a variety of methods to remove as much chemical as possible and relieve symptoms. The standard first aid for burning solutions in the eye is irrigation (spraying or flushing out) with water, keeping the head upwards so that chemicals from the forehead and brows do not enter the eyes. Blow the nose to get rid of the chemicals and avoid rubbing the eyes. There are reports that water may increase pain from CS gas, but the balance of limited evidence currently suggests water or saline are the best options. Some evidence suggests that Diphoterine, a hypertonic amphoteric salt solution, a first aid product for chemical splashes, may help with ocular burns or chemicals in the eye.