Yep..
Our neighbour's dishwasher pongs a bit, not nice.. however, having seen how he uses it, no wonder.. comparing what he does to what we do, here's the obvious advice:
1. Use decent all in one dishwasher tablets (including salt and rinse aid, be careful, some say all in one but in fact are not) or use separate salt/tablet/rinse aid.
2. Don't throw items in with chunks of food on..
3. Don't leave dirty dishes in it for more than a day.
2. Once a week or month, take the coarse filter/trap out the bottom and clean it, one piece of large food that gets stuck there will eventually stink.
3. Use a dishwasher cleaner maybe every 3 months or so
We've had 2 dishwashers over the last 20 years, neither smelt or looked anything other than immaculate throughout (one was 12 years old, the other 8).. We've recently revamped the kitchen and got an integrated dishwasher, it's 12 months old and also looking in good shape with no whiffs..
Our is used at least once per day (usually overnight) and I'm surprised at how reliable they seem to be and how immaculate the stainless interior keeps, but I guess we do go a bit over the top making sure it is treated kindly.
WRT Denby plates, we've got several sets as people bought them for our engagement and wedding gifts.. One set has unglazed parts underneath and both have a rougher glaze than on other sets we have.. None smell though, but I could imagine they might trap more bacteria when drying either in the unglazed part, or just as they dry the rougher surface makes the water take a bit longer to dry or not fully dry.
And that is one thought, are they bone dry? My mums dishwasher leaves things wet, you expect certain items to if water can pool, but not plates.