I use a shampoo with conditioner on mine once a week or so hoping to make it a little softer (the wife likes the look but doesn't like the pokiness). Doesn't really work.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"