Jason F wrote:
"I had two different versions of the Bodum glass teapot and I found
that
they stained too easily. The first had a plastic infuser which got ugly
rather quickly. The second had a metal infuser, but even still the
glass yellowed no matter how much I cleaned it."

Glass is one of the hardest things to actually stain. It is Very easy
to clean with a paste of salt or Baking Soda. I think vinegar will
release tea stains as well. On plastic you might get some real
staining, but even there a vinegar and salt solution might release
that, or oxygen bleach, since that doesn't leave the flavor changes
that Clorine bleach would.

Just my 2CW