A CRJ CAPT RPTS IMPROPER DE-ICE PROCS THAT LEFT HIS ACFT WITH ICE CONTAMINATION AFTER IT WAS RPTED CONTAMINANT FREE.

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WE RPTED FOR OUR FIRST FLT OF THE DAY. THE PREFLT WAS PERFORMED BY THE FO. THE ACFT HAD ALREADY BEEN SPRAYED WITH TYPE 1; 50-50 MIX; BEFORE WE RPTED. THE FO INFORMED ME THAT THERE WAS ICE ON THE WINGS; THE TEMP WAS 6 DEGS C. WE BOARDED THE FLT; AND I EXPLAINED TO THE RAMP CREW THAT WE WERE DE-ICED TOO EARLY BECAUSE THE 50-50 MIX HAD SEPARATED AND RE-FROZEN. WE BOARDED THE FLT AND DE-ICED AGAIN. THIS SAME EVENT OCCURRED THE PREVIOUS MORNING WITH ONE DANGEROUS EXCEPTION. WHEN THE FO DID HIS PREFLT; THERE WAS NO ICE FOUND DURING HIS TACTILE INSPECTION; HOWEVER; I ASKED THE RAMP WHEN THEY HAD DE-ICED; I WAS TOLD IT HAD BEEN DONE 1 HR AND 20 MIN PRIOR TO OUR SCHEDULED DEP. I WENT OUT AND CHECKED THE ACFT AND DISCOVERED THE TYPE 1 50-50 MIX HAD SEPARATED AND FROZEN ON THE OUTER 25 PERCENT OF THE WINGS. THERE WAS APPROX 1/8 INCH OF CLR ICE AND SLUSH MIXED WITH THE TYPE 1; THE TEMP WAS 6 DEGS C. THIS OCCURRED APPROX 40 MIN AFTER THE FO HAD DONE HIS PREFLT. THE STATIONS NEED TO REALIZE THAT THEY COULD VERY WELL BE DOING MORE HARM THAN GOOD BY DE-ICING TOO EARLY. IF I HADN'T DOUBLE-CHECK THE WINGS; I HATE TO THINK OF THE POSSIBLE CONSEQUENCES. THIS NEEDS ADDRESSED ASAP!