Description: Meme of wide-eyed innocent Spongebob on left with caption "coffee stains" juxtaposed again muscular and angry Spongebob on the right with the caption "TEA STAINS".
Sorry if memes aren't welcome here. Just have been experiencing this since my partner drinks morning coffee as opposed to my morning tea, but her vessels can basically just be rinsed out. Whereas removing tea stains actually takes some elbow grease.
I'm on an orange pekoe or yorkshire (bagged), followed by ginger-turmeric green tease (loose) kick at the moment.
I'm honored to hear that you might adopt it, it's a common word here.