I have this going on my wood stove today and it smells so nice and clean in here! I even bought myself a pot from the flea market just for boils, the smells just make me so happy.
Fill a pot 2/3 full of water, slice up 2 lemons and throw them in. Throw in several sprigs of rosemary and 1-2 teaspoons of vanilla. Leave on your stove all day and add water as needed.