Okay, I've gone the routes of cleaning strings(rounds) to make them brighter.Boiling, alcohol, even soap and water. But what about trying to "kill" a set of flatwounds. Tim Drummond once said you had to play them every day for a year before they sounded good. Stephen Stills, who played a lot of bass on his solo releases, said he used barbecue sauce!! Anybody have any tried and true methods?