Simply place 2 teaspoons of vanilla extract into a coffee mug and place in a 300 degree oven for 1 hour. (or on stove top on simmer) Within twenty minutes the whole house smells like Heaven. It's actually a common realtor trick.
Buy mesh bags from dollar store and fill with downy unstoppables then place in linen closet for fresh smelling towels and sheets all the time! I like this idea for the RV closet. We put our hamper in our closet and I worry about dirty clothes funk