Barone swears there is no magic formula. While certain N.F.L. teams put a lot of paint on their fields (San Francisco and Miami are notorious, he said) and certain stains can be trickier than others (helmet paint sometimes requires a steam gun treatment), Barone’s weekly routine rarely varies.

He treats stains with a commercial grade solution of ammonia and protein remover, uses regular Tide detergent — “no bleach and warm water, never hot,” he said. Then he cycles the uniforms in three nondescript washing machines that hold about 15 items each.

“The key? The key is a strong right arm,” Barone said, pointing to the nickname on his shirt — Scrub — and nodding. “I use several brushes, and I really work to get the stains out.”

Barone’s long relationship with the teams has also been built on his diligence. He knows the little things, like how the Giants prefer their uniforms returned with the pants hanging to the back while the Jets want the pants in the front. He knows how important Giants Coach Tom Coughlin’s lucky blue undershirt is. And he knows that Jets Coach Rex Ryan’s famous sweater vest — size XXXL — is a garment to be protected above all else.

“Oh boy, whatever we do, nothing can happen to that sweater vest,” Barone said. “We take care of that one. We’ve got a special bag for that, and it goes right up front.”