Hi my 2004 RX300 RHD has recently becoming worse at demisting, with mist building up quickly, and slow to clear. When it does it clears everywhere except drivers windscreen and passenger window. Ive lost the relevant part of the manual, tried buttons in all combinations, and Im not sure if my recirculation button is working as the light has stopped but the beep sound still works when switched on. Any help or advice gratefully received , thanks! Pete