What about everything else that comes into contact with your wort/beer after the boil? A good soaking in the recommended concentration of PBW, or a like product, for 12 hours and then sanitizing with Iodophor will usually do the trick.
If any of your equipment has scratches or abrasions either replace it or be prepared to do a thorough cleaning and sanitizing before every use. The cost of a bucket, 5 feet of tubing, an auto-siphon or racking cane or a couple of other small items is generally less than the batch of beer you're dumping.
If you don't see anything obvious that may have caused the infection, do a serious review of your cold side brewing practices. From my 10 or so years of brewing I can tell you that, at least where I live, it isn't east to produce an infected beer. Take that as a grain of salt. I live in the high desert where we don't have fleas or termites either:)