Are there any good ways to remove paint from a head tube without facing it? I've a Salsa Spearfish frame to build up. There's a good amount of paint on the upper and lower head tube surfaces. Basically, they have as much paint on them as the outside of the frame has.

Would it work to scrape the paint off with a razor knife? Or is that likely to leave visible chips that I'll regret later?

Sandpaper maybe?

Any other ideas?

Urg! Meant to post this in "Bicycle Mechanics".