Patience, it WILL dry away. But your carpets are going to remain stained with whatever chain lube grease/oil was in the OMS. Or if it was FRESH then eventually with time heat and copious airflow it will all evaporate away and leave your car just fine.
Heat really does help. But you also need lots of airflow. If you don't then the air in the car will simply contain only so much solvent in the same way that air can only hold so much water in any given volume. So you need to have a steady air exchange to allow it to evaporate.