When using soap to hand wash the feeder, or when using a dishwasher, always follow up by rinsing with a mild bleach and water solution to rinse the parts before re-filling with sugar and water. Unique 2 piece base. Innovative flow-control design. High-quality removable parts. Bee resistant inner base. Finally you can clean the inside of a hummingbird feeder. Wide mouth jar for easy cleaning and no mess when adding sugar and water. No drip design even in highwinds! Replacement petals available in yellow and red.