The teapot is dishwasher-safe. To clean without a dishwasher, please use soapy water-- no harsh cleaners please! For tougher jobs, please allow to soak overnight in soapy water. For really dirty teapots, please add a drop of bleach to a lot of water and allow to soak overnight. Rinse thoroughly in the morning.
I've found a simple and very effective way to clean my IngenuiTEA. I fill my sink with hot water and add about half a scoop of OxiClean. After it soaks for an hour or so, you would never know that it wasn't new right out of the box. The plastic remains clear (automatic dishwashing can "cloud" clear plastic), the filter is white again, and even the bits at the bottom which are impossible to rinse are stain-free. After a thorough rinsing, it's right back to making the best possible cup of tea.