I was getting my car washed the other day and there was a sign: “We accept bitcoin.”

Bitcoin! For a $15 car wash!

So I asked the cashier. She looked puzzled. “I don’t know how to do that. It’s supposed to be a big thing,” she said.

Has anyone tried to use bitcoin? “No,” she answered.

Back in its heyday, when bitcoin enthusiasts were pumping up the price to around $20,000 a coin, there were some merchants advertising that they’d take bitcoin in exchange for goods.

When I get the time, I’m going to see how many vendors are still taking bitcoin now that it has lost more than two thirds of its value.