The device works by running current thru the thin wire behind the screen, heating it. Air moving past the wire cools it. The amount of current needed to keep the wire at the set temperature is converted to signal sent to the engine ECU. Do not use anything to "clean" the wire. Simply check that the screen is clear of obstruction and there are no restrictions in the throat.
1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
All my troubles are Rover