Can you guess what it is? Shoveling snow. It falls to begin with, you get rid of it. Then it comes again, you get rid of it. An infinite struggle it is and it's quite pointless too. Because it goes away on its own, if you do nothing, it will still disappear. So just as well to leave it alone and have a little patience.
Of course, if you have a mailman that won't deliver your mail if you don't shovel the driveway, you still gotta do it. :wallbang:
So get one of those mailboxes that are at the end of the drive way. It works wonders, I know :D