Cleanliness is next to......

 The rain outside today gave me no more excuses, I've been putting this job off now for a couple of weeks. It wasn't filthy, just bugging me that there was a spot or two that wouldn't wipe off easily.
YouTube University gives several options on how to do this. None of them are as quick and easy as portrayed.
But, I got it done, and later enjoyed a rather large gin.I deserved it.

Ah well...