I tried alcohol and a cotton swab but that didn't pick up much. So I thought I and my keyboard were doomed. Then one day I realized A PENCIL! It’s uses graphite and it uses an eraser to remove the graphite from the object u are writing on. So I tried the eraser and voila magic the graphite was coming off. So if you ever get graphite on your favorite or brand new keyboard use a pencil eraser and it will come right off. This mite work for other substances.