I ended up ringing Philips re cleaning the filter. With the technology they use, there is no filter in there as such, just a vent which you wipe over from the outside. He said to just clean the outside and the heating coil with a soft, moist cloth. I also asked him about any accessories planned in the future for this model and as far as he knows they are only looking at the double layer rack sometime this year. Any new accessories will be announced on their website when it happens.