Follow Up To First World Problems: That Don't Look Good

When I unplugged the dryer there was a dried green substance around the plug and the wall. I don't think that's supposed to be there.I've plugged the dryer back in and out a few times but still no activity at all.  Door switch seems to move freely.  I vacuumed out the lint from the dryer exhaust tube and it wasn't blocked anywhere I could see, but there was a fair bit of lint build up in there.I