Natural methods for removing ink stains from fabric include applying rubbing alcohol, lemon juice, vinegar, cornstarch, cream of tartar and milk, suggests Reader's Digest. If the ink is still wet, it suggests covering the ink in salt, dabbing it with a wet cloth, and repeating several times if necessary.
Blotting an ink stain with vinegar or rubbing alcohol can also remove stains, notes Reader's Digest. After dabbing the stain with vinegar, it may also help to then make a paste of two parts vinegar and three parts cornstarch. Rub this into the stain, and allow it to dry thoroughly before washing.
Another solution is to make a paste of equal parts lemon juice and cream of tartar. Leave this paste on the fabric for two to three hours, and then wipe it off before washing. Lemon juice or vinegar may bleach or discolor fabric, so HowStuffWorks recommends testing this method on a hidden area before applying it to the stain.
Both Reader's Digest and HowStuffWorks note that soaking the fabric in milk overnight can help to draw out the ink. This method is especially recommended for colored fabrics due to the potential bleaching effects of the other methods.
To remove ink from a carpet, applying a paste made by mixing cornstarch and milk is helpful, notes Reader's Digest. Allow it to dry, brush off the powder, and vacuum.