You have the dreaded red liner. People have reported that the red liner is harder to get off than the other liners. Like Chriscw81 said, burn/grind it or get it sandblasted.
As far as food safety goes, you can pick up a barrel that has held most anything and then just get a really hot fire to burn out any residue that may of been in it and then wipe down with rubbing alcohol to remove any soot or ash that remain.
Sublime Smoke Barbecue
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Weber Mini WSM
Weber Smokey Mountain 18.5"
Sublime Smoke UDS
Lazy man Pitmaster IQ110 w/ rainbox
Superest Fasterest Blue Thermapen
Want to meet some others with the obsession of BBQ? Clicky for the planning of the Virginia/Mid-Atlantic Brethren Bash