Several months ago, a broken sprinkler head under high pressure sent muddy water spraying across the front of our home. The deep front porch took the brunt of the filth, with windows, shudders and our pretty red door dirtied. Though it was cleaned up promptly, it wasn’t until this week that I noticed the porch lights that flank our doorway. Stepping out one evening, I wondered why the light was so muted, and noticed that the glass in the lamps was dingy and smeared with the muck.