I just did this yesterday. The Easy Off had no effect on the liner at first, but after the sun came out and heated up the drum the liner was pealing within a couple hours. After letting the Easy Off work, I took a wire wheel in my hand (not in a drill) and within 30 minutes I had 95% of the liner out. There were still a few spots that the liner didn't come off, so I sprayed it down with the rest of the Easy Off. I let it sit all night, and it will sit all day today in the sun - hoping the rest will come off just as easily. I'll wire wheel any left on, wash, do a little burn with a weed burner, paint and season.
This wasn't a red liner though....it was a tan liner.