MLG ALMOST TAKES OFF WITH THE ENTIRE ACFT DEICED -- EXCEPT FOR THE L WING.

Narrative

PUSHED OFF THE GATE AT CLT. DUE TO LIGHT FREEZING RAIN FALLING AT THE TIME; THE ACFT HAD TO BE DEICED. BECAUSE OF THE LARGE VOLUME OF TFC LEAVING THE GATES AT THE SAME TIME; IT TOOK 2 HRS AND 30 MINS TO ARRIVE AT THE DEICING PAD. NORMAL DEICING PROCS APPEARED TO BE ACCOMPLISHED AS PER NEW FAA MANDATED DEICING PROCS. A DEICING PERSONNEL VIA EXTERNAL INTERCOM ADVISED ACFT HAD BEEN DEICED AND ALL SURFACES WERE 'CLEAN.' A HOLDOVER TIME WAS ESTABLISHED BUT BECAUSE OF A SHORT TAXI TO THE ACTIVE RWY; THE TIME WOULD NOT BE A FACTOR. BEFORE WE COULD STOP THE ACFT CLOSE TO THE END OF THE RWY FOR THE FO TO VISUALLY INSPECT THE WING SURFACES; A PAX NOTIFIED THE FLIGHT ATTENDANT THE L WING WAS NEVER SPRAYED. TOTAL TIME AWAY FROM THE GATE AT THIS POINT WAS 2 HRS AND 50 MINS. I REQUESTED A DEICING TRUCK TO BE BROUGHT OUT TO THE ACFT TO ONCE AGAIN PERFORM THE DEICING PROCS. BEFORE THE CREW COULD START THE SECOND DEICING;. THE FLIGHT ATTENDANT INFORMED ME A PAX WAS GOING INTO WHAT APPEARED TO BE INSULIN SHOCK. I WAVED THE DEICING CREW OFF AND INFORMED GND CTL OF A MEDICAL EMER AND RECEIVED CLRNC TO THE NEAREST GATE. EMER MEDICAL PERSONNEL MET THE ACFT AT THE GATE AND THE PAX ATTENDED TO. AT THIS POINT; THE FO AND MYSELF HAD TIME TO EXTERNALLY INSPECT THE L WING; AND; ALTHOUGH THE R WING AND TAIL SURFACES WERE CLEAN WITH DEICING FLUID; THE L WING HAD NOT BEEN TOUCHED! AN INTERNAL COMPANY INVESTIGATION IS NOW UNDER WAY TO DETERMINE HOW THIS OVERSIGHT COULD HAVE HAPPENED. WITH THE NEW FAA DEICING PROCS; THE LAST LINE OF DEFENSE AGAINST CONTAMINATED FLT SURFACES IS THE PRE-TKOF VISUAL INSPECTION. (WHICH WE NEVER GOT TO THAT POINT) I AM NOW A STRONG BELIEVER IN THE NEW DEICING PROCS AND CAN ONLY HOPE THE PRE-TKOF INSPECTION WOULD HAVE CAUGHT WHAT COULD HAVE BEEN A DISASTROUS OUTCOME! CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR REITERATED MOST OF THE INFO IN HIS RPT. HE ADDED THAT THE VALUE OF INSPECTING THE WING FOR ICE FROM INSIDE THE CABIN; ESPECIALLY AT NIGHT; IS QUESTIONABLE. HE SAID THAT THE TYPE II DEICE FLUID IS THE CONSISTENCY OF WARM HONEY AND WHEN IT COVERS THE CABIN WINDOWS; VERY LITTLE CAN BE SEEN THROUGH THEM. HE IS VERY CONCERNED AND HOPES A BETTER METHOD OF ENSURING CLEAN AIRFOILS CAN BE DEVELOPED. THIS WAS A SCHEDULED 40 MIN FLT. THE DIABETIC PAX EXPECTED TO BE AT DEST IN PLENTY OF TIME TO AVOID SHOCK BUT THE ALMOST 3 HR DELAY THWARTED THAT PLAN.