One of my friends sent me SMS saying her husband laundered her office's flashdisk.
I told her to rinse it well so there would be no soap (alkali) residue in the drive. Then shake the water off it (not too violently). Let it dry (not sun dry) for at least 2 days. (She waited 5 days)
When she finally tried the drive, it had all the data intact. Have no idea what brand it was, except that she said it was 2Gb