Me dear old grandmother, born, raised and lived her entire life in the Ozark Mountains, put an R in “wash.” It’s one of those quaint, fond memories I have. Not sure if I’ve ever heard anyone else do it.
Forget Tijuana. Few Americans can correctly pronounce Juarez.
Another long-time sherberter until I realized that everybody around me was adding an unneccessary ‘r’ (around 25 years old). Now, I annoy everybody by pronouncing it ‘correctly’ as sherbet.
Also, when I say it, I’m only ever talking about a kind of fizzy powdered confectionery product - because that’s more or less exclusively what the word means here in England.
Icy, usually-fruity desserts are sorbet - pronounced sore-bay.
Juárez, as the accent indicates, is pronounced HWAR-es, the E being a bit more like an English A; I tend to swallow the H a little, so it’s not heavily aspirated.
As I said, that’s how I hear it from the locals, but when I say it like that to fellow Americans, even in Texas (especially in Texas?), they’ll look at me funny and go: “Hunh?” Then I say “War-EZ” in my best redneck voice, and they always get it.