Apparently I drink tea at a slower rate than I used to – or I always drank from dark cups and never saw the staining that was occurring… Either way, I’ve got a pretty good solution now: SOS pads!
I used the SOS Juniors, but I suppose that large teapots could use the regular-sized pad. And, of course, don’t forget to rinse well. Really well, ’cause you wouldn’t want blue SOS residue plus orange pekoe. Blech! I rinsed a lot as I was cleaning and then boiled water a couple times to run through each pot. (I had two that needed work, my regular Brown Betty and a larger one I use when there’s company.)