He Knows the Stars’ Dirty Laundry. Because He Washes It.

BERLIN — One afternoon in November, Hans-Jürgen Topf walked through the backstage area of the Mercedes-Benz Arena, where dozens of crew members were unloading the equipment for the final stop of U2’s “Experience + Innocence” tour. After enthusiastically greeting and hugging several of the workers, Topf, 62, came to a sweltering room filled with humming washing machines and dryers. “This is my life,” he said. “The artists live their life, and I live my laundry life.”

The world’s top specialist for tour laundry, Topf has traveled with many of the world’s biggest music acts, including Madonna, Pink and Beyoncé. As tours have become bigger and more professionalized, their logistics have become increasingly daunting. The U2 tour, which lasted about seven months and spanned two continents, included roughly 150 people, all of whom needed food, housing and clean clothes.

That’s where “der Topf,” as he likes to call himself, comes in. His company, Rock ’n’ Roll Laundry, provides equipment and laundry staff for touring productions. Although Topf didn’t join the U2 tour because of a back injury, he was in Berlin to pick up machines he had rented to the crew. (He mostly stays within Germany these days, because of his back, but previous tours have taken him as far as South America and Australia.)

“My reputation precedes me,” Topf said, adding that, in the music world, “nobody tackled the subject of laundry, nobody wanted to learn it, until I developed a system for it.”

“He is a pioneer,” Jake Berry, the tour’s production director, said by phone. Twenty years ago, Berry said, most tour laundry had to be done quickly during tour stops at a local laundromat. He said the clothes would come back wet, or, “you’d find a girl’s thong in there.”

In the early 2000s, Berry said, a “little man” — Topf — began appearing outside German venues with a van, offering to pick up, wash and return the production’s clothes. Berry said that the items were returned “pristine and folded.” Soon after that, he invited Topf to join him on tour.

“It’s very hard to find someone who is passionate about laundry,” Berry added. “He is passionate.”

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A few weeks after the U2 concert, Topf, who has a gray beard and wears metal-rimmed glasses, was in the basement at the Max-Schmeling-Halle, another venue in Berlin, helping his son Achim, 31, do laundry for Die Fantastischen Vier, a popular German rap act.

The biggest challenge of doing tour laundry, Topf explained, was the volume, which can vary unpredictably, and the need to work without fixed facilities. He often had to work outside or wherever he could find running water, he said, including, at one point, in empty holding cells intended for disorderly fans in a South African stadium. “I know every disabled bathroom in every German football stadium,” he said.

When he is on tour, Topf begins almost every day by washing the performers’ clothes, which usually have to be air-dried with a small fan. The most soiled garments he ever handled, he said, were coveralls worn by the metal band Slipknot that had been sprayed with beer, cream and fake blood, and left in garbage bags for three days.

The most common stains on performers’ clothes, he said, were sweat and aluminum dust from truck ramps carried onstage by equipment-case wheels. The dust gets on the clothes when performers throw themselves on their knees or roll around onstage. The best solution, he said, was for crew members to put down mats: “It’s better for the pants.”

Washing artists’ clothing involves high stakes. Topf recalled one incident, in which Joe Cocker grew furious after a discolored line appeared in pants that Topf had washed. “I haven’t forgotten that my whole life,” he said.

He also once shrank a golden pair of pants that belonged to David Hasselhoff, and a mistake by a dry cleaner Topf had hired once ruined a $3,000 vest belonging to Janet Jackson, he said. But he is quick to point out that mishaps are rare: “Der Topf is mega-reliable.”

When on tour, he often spends three to four hours every afternoon ironing the performers’ clothing, his least favorite part of the job, while simultaneously washing the crew’s garments. On some tours, he spends up to 20 hours a day doing laundry, he said. After a show, the machines go into specially built rolling cases, so they can be loaded onto trucks and brought to the next location.

Topf pointed out that the touring business has become much more professional and business-oriented since he began. He used to find drugs in the clothes all the time, he said, adding, “These days, I’m more likely to find an herbal tea bag.”

Joe Pomponio, a stage manager for numerous festivals in Europe who has worked frequently with Topf, said by phone that, for many acts that have spent years on the road, comforts like professionally done laundry have become vital. He added that he did not know anybody who offered services comparable to Topf’s, and that Rock ’n’ Roll Laundry was a fixture on the European festival circuit. “Der Topf is everywhere,” he said.

Topf was born in 1956 to a family of East German refugees. In the communist G.D.R., his father worked as a smuggler, secreting people across the Iron Curtain in potato shipments. After he was caught by the East German secret police, Topf’s father escaped with his wife to Ludwigshafen, then in West Germany, where they founded a laundry. Topf is still based there.

One evening in 1982, while making a delivery for his parents’ business, Topf noticed Ted Nugent’s tour bus, seemingly lost. After giving the driver directions, he was given free tickets to the concert, and later that evening, offered to clean the band’s clothes. When Nugent’s manager encouraged him to continue his services, he began standing outside concert venues “like a groupie” and offering same-day laundry services to visiting music acts, including Elton John and Blue Öyster Cult.

He eventually bought a small truck, loaded in two washers and two dryers, and drove alongside touring bands. At night, he would sleep on top of his machines, doing laundry during the day for the Bee Gees, among others. Today, Topf’s business makes much of its income by renting out machines to touring productions, and it recently partnered with a businessman who has started an American version of Rock ’n’ Roll Laundry. Topf also runs a laundry business in Ludwigshafen catering to businesses and restaurants.

The laundry in Ludwigshafen, he said, features an extensive collection of photographs of his favorite customers, including Phil Collins and Harry Belafonte. Topf said that Belafonte had signed his photo, “Thanks for taking the rocks out of my pants.”

“I have no idea what that means,” Topf said, “but that’s the kind of thing you keep.”