We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
A service guy asked me to clean out my dishwasher drain filter because it grossed him out. That was a humiliating experience. Clean your own once in a while to avoid that unpleasant experience. Chances are that it is full of gunk.
Also, there is a vent in the door. Steam from hot water entering the dishwasher can increase the pressure inside slightly and force water out through the door seal. The vent prevents pressure build up.
Over the years the door gets filled with gross stuff that can block the vent.
Dissassemble the door every few years and clean out the sci-fi horror movie crap that is in there. Especially do this if your door leaks.
Our dishwasher began leaking, and we were contemplating getting a replacement. Then my husband decided to take a look at the door and found that particular vent. After 20+ years, needless to say, it was totally plugged. It's been cleaned up and all is well.
I clean mine pretty often, because otherwise the dishes don't come out clean. The grease-trap in my oven's vent-hood was another matter: I didn't even realize it came apart to be cleaned until an amazing pile of tarry gunk had built up in it. That reminds me that it's time to do it again. Unlike the dishwasher filter, it's kind of a pain to get to.
I seem to remember one of our dishwashers had slicing blades or something that got rid of that gunk in the filter, precisely so that the exhausted new parents we then were wouldn't have to rinse off the dishes or have the hassle of clearing out a drain.
However, now that dishwashers are so flimsy one has to replace them every five years instead of thirty, I have a theory why we get all this crud in the bottom. The reason is the damn energy efficiency. In the past, there was so much water, and it was so much hotter (YES! germ killing!) swirling thru that I think it diluted the gunk more and forced it thru and down the drain. I suspect that we are all eating off plates that are a lot less clean just as our cars now have grit on them from carwashes that recycle the water they use to wash them. Washing machines that are energy efficient and use less water definitely wear out the clothes faster, and this is what set me to wondering what the effect of a dishwasher with less water swooshing thru it might be....