UR more for carbons, draught lines etc.
For food PB is best.
That said, food stains can set in pretty quick.
Try PB and speed dry with hairdryer.
If you have Prochem Spotters they recommend Stain Pro and Neutral Pro-Spotter. These are good all rounders and worth a try.
You say 'coming back' this indicates it had gone but is wicking back. Flush through lots more and then speed dry as suggested.