Keeping your letters clean

Spring is on the way and it is always really windy and dusty. I hate it when dust gets into the letterbox and then my letters get dirty :(

An easy way to stop the problem is to go to a 100yen shop and buy a piece of fake grass tile. Cut the tile in half to fit into your letterbox, and now the dust will fall down under the tile and your letters will be on top. Clean!