A BE55 CFI PLT ENCOUNTERS SEVERE ICING WHEN DEPARTING PHN; MI. RETURN LAND.

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TOOK OFF; CONTACTED SELFRIDGE APCH; PICKED UP IFR CLRNC PRIOR TO REACHING 2000 FT. GIVEN VECTOR AND CLRED TO CRUISING ALT OF 3000 FT. AT 2500 FT; I ENCOUNTERED FREEZING RAIN; ALL ANTI-ICE EQUIP (WINDSHIELD HEAT; DEFROST; PITOT HEAT; ALCOHOL PROPS AND WINDSCREEN; BOOTS) ACTIVATED ON CLBOUT (LESS THAN 2000 FT). WINDSCREEN OBSCURED BY ICE; ALL SURFACES ICE COVERED. I NOTIFIED APCH THAT I 'HAD ICE EVERYWHERE' AND THAT I WAS 'GOING BACK.' I BEGAN TO DSND OUT OF IMC AND TURNED TOWARD PHN. I ASKED FOR A VECTOR TO RETURN TO PHN; AND WAS GIVEN 090 DEGS. I DSNDED TO 1900 FT MSL. THE CTLR DID NOT GIVE ANY ADDITIONAL HDGS OR ALT TO ME AT THIS TIME. I HAD TURNED AND DSNDED ON MY OWN WITHOUT ADDITIONAL CLRNCS. I ALSO HAD NOT DECLARED AN EMER. I MUST ADMIT THAT I WAS SOMEWHAT FLUSTERED AT 1) BEING IN FREEZING RAIN AND 2) BEING ESSENTIALLY IN VMC AND HAVING THE WINDSCREEN STILL OBSCURED. I WAS TOO BUSY TO STOP MY INST SCAN TO PUNCH IN PHN TO RETURN VIA GPS. AT THAT POINT; THE CTLR INSTRUCTED ME TO CLB TO 2300 FT FOR VECTORS FOR THE ILS. I MADE VISUAL CONTACT WITH THE RWY AS THE ICE BEGAN TO CLR FROM THE WINDSCREEN. I WAS ON A 3-4 MI BASE LEG FOR RWY 4 AT PHN. I LANDED WITHOUT FURTHER INCIDENT.