The following information is provided by Hewlett-Packard:
How to remove ink stains from hands and fabric
NOTE: IMMEDIATELY rinse the stained area with cold water, then follow the appropriate instructions.
To remove ink stains from hands Wash hands with an abrasive (gritty) soap.
To remove ink stains from white fabrics If ink from an HP Inkjet print cartridge spills on white fabric, use chlorine bleach and cold water to remove the stain, but act quickly.CAUTION: Use cold water. Warm or hot water will “set” the color into the fabric.
To remove ink stains from colored fabrics Use sudsy ammonia—a dilute mixture of detergent and ammonia—and cold water. Act quickly and test on an inconspicuous area first.
CAUTION: Use cold water. Warm or hot water will “set” the color into the fabric.WARNING: Do not mix ammonia and chlorine bleach; this creates a toxic gas!