HP Deskjet 3820 Color Inkjet Printer - Manual (Page 62)

removing ink from skin and clothing
Follow these steps to remove ink from skin and clothing:
to remove ink from... do this...
skin Wash the affected area with an abrasive soap.
white fabric Wash the fabric in cold water using chlorine bleach.
color fabric Wash the fabric in cold water using sudsy ammonia.
Caution! Always use cold water to remove ink from fabric. Warm or hot water
may set the ink color into the fabric.