Detergent prohibition

What happens when a local government bans name-brand dishwasher detergents and forces residents to use ones that don't work as well?  A black market in Cascade, of course:

there has been a quiet rush of Spokane-area shoppers heading east on Interstate 90 into Idaho in search of old-school suds.

Real estate agent Patti Marcotte of Spokane stocks up on detergent at a Costco in Coeur d'Alene, Idaho, and doesn't care who knows it.

"Yes, I am a smuggler," she said. "I'm taking my chances because dirty dishes I cannot live with."

[...] Marcotte said she tried every green brand in her dishwasher and found none would remove grease and pieces of food. Everybody she knows buys dishwasher detergent in Idaho, she said.

[...] "I'm not hearing a lot of positive feedback," conceded Shannon Brattebo of the Washington Lake Protection Association, a prime mover of the ban. "I think people are driving to Idaho."

Steve Marcy, manager of the Costco in Coeur d'Alene, about 10 miles east of the Washington state line, estimated that sales of dishwasher detergent in his store have increased 10 percent. He knows where the customers are coming from.

"I'll joke with them and ask if they are from Spokane," Marcy said. "They say, `Oh yeah.'"

You laugh now, but what happens when possession is criminalized and the ban spreads so that unrestricted locales like Idaho aren't as close by? We'll end up with soap dealers on shady corners, police Cascade raids, and mass housewife violence. They want clean dishes!