How do I clean a textured concrete planter box that's gotten dirty?

Oh, you should see me right now—I’m a textured concrete planter box, and I’ve been through a lot. Rain, dust, fallen leaves, and maybe even a little bird droppings have left me looking dull and crusty. But don’t worry, I can be revived. Here’s how to clean me up without ruining my beautiful, rough surface:

First, give me a gentle rinse with a garden hose to loosen the surface dirt. Don’t use a pressure washer too close, though—I’m tough, but my texture can chip if you blast me too hard. Next, grab a stiff-bristled brush (nylon is best, since metal bristles might scratch me) and mix a solution of warm water and mild dish soap. Scrub me in circles, working the solution into every crevice and groove. Pay extra attention to corners where moss and mildew love to hide.

If I have stubborn white mineral stains or lime deposits, you can use a 1:1 mix of white vinegar and water. Let it sit on the stains for about 10 minutes, then scrub gently. For green algae or moss, a little baking soda paste (baking soda plus a few drops of water) works wonders without harsh chemicals.

Once you’ve scrubbed me thoroughly, rinse all soap and vinegar residue off with clean water. Let me air-dry completely—ideally in the sun, which also helps kill any lingering spores. And here’s a secret: once I’m dry, you can brush a thin layer of linseed oil onto my surface. This will protect me from future dirt adhesion and make the texture pop beautifully.

Now, serve me a healthy plant, and I’ll look stunning on your patio for years. Just give me a quick rinse every few months, and I’ll stay proud and clean.