So how often do you inspect all your appliances? Is there any routine maintenance you do on the machines?

Usually once a month I check the sumps/screens/filters on the DWs for snots and gunk. I also give the spray arms a once over to see if any snots got caught in the holes.

I send the washers through empty with hot water and some bleach every 6 months of so. 

I usually inspect the Maytag once every 3-4 months, by taking the front off. The portable KM I usually inspect around the same time frame too. 

As for polishing, thats every week!