If a so-called public relations expert says the only way your hotel and restaurant would recover from a PR disaster is to get “a makeover from celebrity chef Gordon Ramsay,” just go ahead and pack it in.

The Sydney Morning Herald reports that final tests on the gelato at the centre of the Coogee Bay Hotel poop scandal have come back inconclusive, with the DNA trace too weak to identify the person responsible for the murky affair.

The NSW Food Authority has declared "case closed" after completing testing on a sample of gelato served to the Whyte family at the hotel on October 5, and which was found to contain faeces.

The hotel and the family reached a settlement last month, with the family being paid compensation believed to be about $60,000. Both parties have declined to discuss the matter in the wake of the settlement.