An effective method for deep cleaning something you come into contact daily: your shower head. An odorless alternative to vinegar, PowerShower Powder comes in pre-portioned packets that can be easily poured into any cleaning vessel (e.g. a plastic bag) and filled with water from the shower itself.
PowerShower Powder
$5.00Price
Each order comes with two packets. Use one packet for roughly every 4 cups of water. For reference, for a gallon-sized plastic bag, this would be one packet for a ~quarter of the bag, or two packets for ~half of the bag.