A FOKKER 100 ACFT LOSES MUCH OF ITS AUTOFLT SYS SHORTLY AFTER LIFTOFF FROM DTW CAUSED BY BLOCKAGE OF THE ACFT PITOT TUBE.

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LOCATION: DTW RWY 21C. ON TKOF AT DTW; I LOST THE AIRSPD INDICATOR ON THE CAPT'S SIDE. WE THEN LOST YAW DAMPER 1; STABILIZER TRIM 1; AT 1; RUDDER LIMITER AND WINDSHEAR GUIDANCE. ALSO LOST THE FLT DIRECTOR ON THE CAPT'S SIDE. THE FLT DIRECTOR WOULD NOT SLAVE TO FO'S SIDE. THE AIRSPD ON THE FO'S SIDE WAS QUESTIONABLE. THE FO HAD SPD LIMIT WARNINGS ON HIS PFD AND HIS AIRSPD HOOK WAS INTERMITTENT AND ERRATIC. WE USED THE STANDBY AIRSPD INDICATOR AS OUR PRIMARY AIRSPD INDICATOR. WE DECLARED AN EMER AND RETURNED TO DTW FOLLOWED BY AN EVENTFUL APCH AND LNDG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE FO WAS FLYING THE ACFT. SHORTLY AFTER LIFTOFF THE CAPT LOST HIS AIRSPD INDICATOR; THEN STABILIZER TRIM; THEN YAW DAMPER; FOLLOWED BY #1 AUTOTHROTTLE. FLC SLOWED THE ACFT DOWN; DECLARED AN EMER; AND ASSESSED THE SIT. INITIAL FEELING WAS THE AIR DATA COMPUTER FAILED OR A PITOT TUBE FAILED. THE FLC GOT THE ACFT SAFELY ON THE GND AND TAXIED BACK TO THE GATE FOR MAINT HELP. MAINT FOUND A STICKY SUBSTANCE IN THE CAPT'S PITOT TUBE. IT WAS SURMISED THAT AN INSECT OR INSECTS FLEW INTO THE PITOT TUBE AND MELTED WITH THE HEAT THAT WAS BEING APPLIED TO THE PITOT TUBE. THE PITOT TUBE WAS DISMOUNTED AND AIR BLOWN THROUGH IT TO CLR THE OBSTRUCTION. AIR PRESSURE WAS NOT ENOUGH AT 150 PSI SO A RIDGED PIPE CLEANER WAS USED TO CLR THE OBSTRUCTION. IT WAS VERY SOLID MASS AND DIFFICULT TO CLR. ONCE CLRED; THE ACFT DEPARTED AGAIN AND ALL SYS WORKED PROPERLY.