The Procter & Gamble Co. is starting a massive ad campaign to try to revitalize the Clairol hair care brand it acquired from Bristol-Myers Squibb Co. in November. “This intensive initial campaign is just the beginning of our efforts to re- energize Clairol as a global hair-color leader,” said Rob Matteucci, president of P&G’s Clairol division.The saturation campaign, which begins today, will include broadcast ads, a billboard in New York’s Times Square and eight...