How do I remove DC offset from audio track?

Getting Stuff Done How do I .... ?
#1

The track I’ve recorded seems to have DC offset. How do I remove the offset in Ardour?

#2

20hz highpass it and bounce to it another track?
Glame highpass plugin is good.

#3

There is a LADSPA plugin that will remove DC offset.

#4

Thanks for the suggestions!