Let's hope someone gave them a wash over the years.
Six strands of legendary musician Kurt Cobain's hair – cut by a friend in 1989 – is up for auction, with a minimum bid of $2,500 (£1788).
Jimi Hendrix's locks have a minimum bid of $1,500 (£1,066) and John Lennon's must sell for at least $750 (£533).
The hairs are just a few of lots in an online rock memorabelia auction closing this Saturday.
The sale by Iconic Auctions in Scottsdale, features a series of Nirvana offerings that include one of Cobain's amps and a rare Stratocaster-style guitar signed by the group.
The amp has "Kurt" written faintly in the top right corner and was used by Nirvana during the '90s, and on the band's "Live and Loud" video.
The minimum bid is $15,000 (£10,667) but it could go for more after a guitar Cobain used for his MTV Unplugged show recently sold for $6 million (£4.27m).
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The item with the highest minimum is a collarless, dark blue jacket custom made for Paul McCartney with bidding starting at $25,000 (£17,780).
It was worn onstage during a six-night run at the Gaumont Theatre in Bournemouth in 1963.
Tricia Eaton, East Coast consignment director at Iconic Auctions, said the jacket is one of the Beatles' earliest stage-worn garments ever to come to market and captures the band moving on from jeans and leather jackets.
There's also a copy of Sgt. Pepper's Lonely Hearts Club Band signed by McCartney, George Harrison and Ringo Starr, and a sheet of handwritten Blowin' in the Wind lyrics signed by Bob Dylan.
The album's minimum is $5,000 (£3,560) and Dylan's lyrics have a minimum of $15,000 (£10,670).
Other treasures include band-signed copies of Led Zeppelin II, Queen's self-titled debut, Bob Marley's Kaya, Dr. Dre's The Chronic, The Clash's Give Em' Enough Rope and Pink Floyd's Animals.