The owners manual with my fridge was very clear about cleaning the jet. It has a precision hole so do not use a pin to clean it. It suggested washing in alcohol and blowing air through it. I also read where it said to avoid high pressure air.
In my case that did not solve my burner problem. (I had already confirmed the burner, flue, and propane pressure were in good shape). I took the jet out again and inspected it with a magnifying glass. There was a metal burr right in front of the hole. I removed it successfully without affecting the hole and the fridge now runs great on propane - even on medium.
Peter J, New Brunswick, Canada
2001 Palomino Pony 21
MEC Tarn2 (6 lb) - Backpacking, Canoeing