Price, aka Jordan, left the jungle last night after the public voted for her to do the bushtucker trials every night since she arrived.
Speaking to PRWeek, Clifford said: ‘It was not a good move for her to go in there. It would only have been good if it had improved her popularity but it has not. The damage done to her over the past six months has not been eradicated by five or six days in the jungle.'
He added: ‘The public are disenchanted with her and it has reaffirmed her unpopularity. It would only have been worthwhile if she had emerged covered in glory but she hasn't.'
ITV announced her departure in a single-line message posted on its website.
Price has been fighting a PR battle since her high-profile split from ex-husband Peter Andre earlier this year. She also split from her long-term publicist Claire Powell at the same time and turned to Alan Edwards' the Outside Organisation.
M&C Saatchi Sport & Entertainment chief executive Steve Martin said: ‘On paper, her appearance in the jungle was a good move as it would give her a chance to talk freely and get her point across. However, in reality, she has been humiliated by the public.'
Martin also advised that Price now needed to take a break from courting publicity in an effort to turn around public opinion: ‘She needs to disappear for a while and plan a comeback in a year's time. Her media profile has been saturated and she needs to go underground.'
However, EdenCancan creative director Nick Ede said Price's appearance has been beneficial: ‘It was a very good PR move for her to go back into the jungle. She has managed to befriend the celebs in the jungle and the viewing public has been given affirmations from cynical celebs that she's a good girl so that has to be a positive. I think in the end she's done her job well.'
He added: ‘I think this has done her the world of good and my advice would be to now go quiet for a few months to concentrate on her family and businesses.'
Public 'disenchanted' with Jordan despite jungle appearance, says Max Clifford
Celebrity publicist Max Clifford has slammed Katie Price's brief stint in ITV's I'm a Celebrity... Get Me Out of Here reality show.
