Carpet cleaner will do the trick, and I'm refering to professional grade stuff like Zep. Delute it down and put it in a spray bottle spray everything with it including the roof. Then while it is still wet scrub everything with a stiff brush except the roof. Now wipe everything including the roof with a towel. Works pretty good to draw all that tar out. We have a spray at work that works like Frebreeze and it does work called Bradley's All Purpose Cleaner, don't know where you'd get it on the open market though. I just went through this with the H3 and it worked like a charm.
