On the 15th of every month I take a few minutes to do some small, but important tasks in the kitchen. The counters are constantly being wiped down, as is the stove top, but on the 15th I take time to boil water and then clear and clean both drains in my kitchen, throw out my old sponge and bring out a new one, and empty the crumb catcher in the toaster oven. I'll do other small tasks, too -- like restocking my rag box, checking the filter on the water pitcher, sharpen a knife, and so forth. I kinda just go in there and see what grabs my attention.
In case you're wondering, I clear and clean the drains using very basic supplies. I dump in some baking soda, then some vinegar, wait a minute or 2 and then pour a few cups of boiling water down the drain. If I'm feeling particularly Martha Stewart-ish I can even boil the water with a couple slices of lemon.
But I'm not one to buy a lemon just because I want pretty smelling drains.