Simmering granules vanilla an ideal way to refresh your home is to warm a couple of teaspoonfuls of simmering granules in an oil burner or vaporiser placed in to a oil burner reservoir and require no water. can also be used as ashtray refresh, or to generally fragrance a room. chase away cigarette odour by placing a few granules in ashtrays. you can also add them to your bath water like a bath salt.