A B737-800 ON TOW INTO GATE STRUCK A DEICING TRUCK INCURRING DAMAGE TO THE L WING; #1 SLAT; AND ACCESS PANEL. CAUSED BY LACK OF ATTN BY THE L WING WALKER.

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FLT ABC FROM ZZZ TO ZZZ1. FLT PUSHED BACK 150 YARDS FROM GATE IN STEADY SNOWFALL WITH RAMP COVERED IN 3/4 INCH LOOSE SNOW. AFTER DEICE/ANTI-ICE; WE NEEDED GATE-RETURN TO DEPLANE WILL PAX. WE NEVER STARTED ENGS. I CALLED OPS FOR A TOW-IN. COORDINATED WITH TOW CREW AND GND CTL AND CHKED AREA CLR. ABOUT HALFWAY TO GATE; FELT ACFT SLIDE AND SAW MARSHALER IN FRONT OF THE TUG SIGNALING AN EMER STOP. I XMITTED 'STOP; HE IS SIGNALING YOU TO STOP.' AFTER STOPPING; I GOT NO FURTHER RESPONSES FROM THE TUG DRIVER. THE L OUTBOARD WING HAD STRUCK A DEICE TRUCK. THE TRUCK WAS TILTED UP ON 2 WHEELS AND HELD BY THE WING. I NOTIFIED OPS AND REQUESTED MAINT ON THE HEADSET IMMEDIATELY FOR EVALUATION. MAINT ADVISED THERE WAS NO DAMAGE TO THE WING FUEL BLADDER AREA; AND THAT NO FUEL WAS LEAKING FROM THE ACFT OR TRUCK. THE TRUCK APPEARED TO BE FIRMLY WEDGED UNDER THE WING AND WAS STABLE. AT THIS POINT; COMS BECAME VERY HECTIC WITH MULTIPLE CALLS ON RADIO; PA; AND CABIN; AND GND INTERCOM. AT SOME POINT; I BELIEVE I MAY HAVE INADVERTENTLY BEEN PUSHING THE CVR ERASE BUTTON; AS IT IS IN PROX TO THE CABIN AND GND CREW CALL BUTTONS. ALL PAX WERE SAFELY DEPLANED VIA STAIRS AFTER THE DEICE TRUCK WAS STABILIZED WITH HVY EQUIP. ACFT DAMAGE WAS LIMITED TO A DENT IN THE #1 SLAT AND AN ACCESS PANEL.