A couple of months ago, in the privacy of his Reston, Va., townhouse, Alan Chien made a final break from cultural tradition, a guilt-filled...

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A couple of months ago, in the privacy of his Reston, Va., townhouse, Alan Chien made a final break from cultural tradition, a guilt-filled decision he has yet to share with his parents.

He used his dishwasher. He knows his parents will not understand.

“They don’t believe in it,” said Chien, 35, an engineer who emigrated with his family from Taiwan when he was a toddler. “Just because they never used it, I never used it, so it was just a mysterious thing to me.”

In many immigrant homes, the automatic dishwasher is the last frontier. Long after new arrivals pick up football, learn the intricacies of the multiplex and the DMV and develop a taste for pizza, they resist the dishwasher. Some joke that not using the appliance is one of the truest signs of immigrant heritage, whether they hail from Africa, Latin America, Asia or Eastern Europe.

If they have a dishwasher — and many do, because it is standard equipment in most homes — it becomes a glorified dish rack, a Tupperware storage cabinet or a snack-food bin. It’s never turned on.

Officials at appliance companies have noticed: Sears doesn’t even highlight the appliances in its ads in Spanish-language media.

It’s a quirk in the assimilation process that baffles social scientists. “It’s really striking,” said Donna Gabaccia, who studies immigration and culinary history at the University of Minnesota. In the home, “technology is generally embraced by women. Certainly in terms of technology, their homes don’t look that much different from Middle American homes.”

Gabaccia said one explanation could be that immigrants can absorb only so much change. The dishwasher is a U.S. invention, and outside the United States, Canada and Western Europe, they are uncommon. In most countries, people cannot afford them; if they could, then they already have maids, who can do the dishes by hand.

Graciela Andres laments that her daughter, son-in-law and three grandchildren have abandoned washing by hand. “They do it the American way: They put everything in the wash machine, no matter if it’s a little spoon,” said Andres, who emigrated from Bolivia in 1981.

She does not disdain her family’s clothes washer and dryer, microwave, heavy-duty mixer, DVD player or computers. But the dishwasher?

“I think if I wash by my hands, I do a better job,” said Andres, 65, of Germantown, Md. “We have to fill up the dishwasher. If you do it by hand, it gets clean right away.”

Her daughter, Grace Rivera-Oven, says she cannot afford not to use it. Her five-cycle, stainless-steel Kenmore allows her to spend more time shuttling her children to baseball and soccer, serving on community boards and writing.

A 2004 economics report from the government of India noted that a growing middle class had pushed up sales of clothes washers, refrigerators and small appliances by 20 percent a year. Dishwashers, however, were a “negligible market.”

In tech-crazed South Korea, many families boast refrigerators with built-in TV screens and a cooler that regulates the temperature especially for jars of kimchi, the spicy pickled cabbage — but no dishwasher.

At Sears, officials do not make much of an effort to market dishwashers to immigrants. The company’s Kenmore Elite TurboZone was touted in mainstream media, but Spanish-language newspapers and magazines ran only general ads about appliances.

Anecdotal evidence from Sears associates and customers suggests that Hispanics care far more about cooktops than dishwashers, said Tina Settecase, vice president of home appliances.

“We’re very careful about not changing our Hispanic customers,” she said. “We’re just trying to identify what the Hispanic customer wants and supply it.”

But Mike McDermott, general manager of merchandising at General Electric, wonders whether more information about dishwashers might make a difference.

Like other appliance-makers, GE extols the dishwashers’ energy efficiency. The U.S. Department of Energy agrees, citing findings that dishwashers, with a full load, use half as much water as washing by hand. Statistics from the D.C.-based Association of Home Appliance Manufacturers show that using the dishwasher six times a week costs $49 a year, a little more than the refrigerator.

“Where there isn’t a dishwasher in a home, we need to understand why it’s not there,” McDermott said, “and what are some of the tools we can use to educate the consumer.”

Dr. Bernie Fischer, a self-described “typical white guy” who grew up in Baltimore, knows all the benefits of the dishwasher. His parents had been so attached to theirs that they used it even though the wash cycle caused the lights to dim in their aging house.

But these days, his dishwasher is simply a drying rack. It was his wife’s idea. Mary Ngo is a Vietnamese American.

“Mary’s kind of set in her ways,” said Fischer, 29, a Columbia psychiatrist.

“I just don’t see the practicality of using the dishwasher,” explained Ngo, 28, a job trainer born and raised in Montgomery County, Md.

But she does let her husband turn on the appliance every two weeks — to clean it, not the dishes.