admittedly if might be a couple of months since I last cleaned it with a toothbrush and hot clean water - but look at it now! . WW90T534DAW Autodose Washing Machine series 5
I would just like to point you to the Advertising Blurb on the Currys website for the machine :
"- A Stay Clean drawer and Eco Drum Clean function gets rid of any detergent build-up"
ah right yes... a stay clean drawer - very interesting!!
And this off of the official Samsung site for this machine:
in reality this is what you get - it does not look clean to me!:
Don't always believe everything you read and don't believe the hyped up manufacturers advertising! - no problem at all if they say "we stand by what we say (or advertise) or your money back" - but they don't, once you have bought it that's it you are on your own!
Machine is just over a year old and I am happy with it on the whole - its just that when you do your research and certain features do not live up to their expectations when you read the advertising blurb ... well you do feel like you have been done over a bit or had or duped into buying!
our water is not really that hard where we are at all, the kettle in the kitchen doesn't seem to furr up and there is no limescale around the taps or sink. - so its a bit surprising there is quite a bit of limescale in the drawer housing
#ww90t534daw
is your machine the samsung autodose @EcoBubbleUser944 ? the detergent compartment looks totally different to mine at the back there
If this is what Samsung means by a 'Stay Clean Drawer', then it's just a waste of money. I've spotted around 8 nozzles at the back of the detergent drawer housing. This only forms a massive puddle of water on the dispenser 1 cover on the machine. Pointless. 
mines the same design as yours I think (I must get my old toothbrush out tomorrow and clean that mould and limescale again, done it not so long ago , amazing how it gets bad quickly) - yours is nice and clean compared to mine
