Drop-in rust stain remover
Drop it in. Shake it. Rust is done.
SpraySticks sticks dissolve in your own spray bottle and turn the water a bright color so you can see it is working rust remover. Gallon pods do the same for pump-up and backpack sprayers. Every dose is pre-measured, so there is no scooping and no guessing how much acid goes in a gallon.
Pick your line
Why a stick instead of a jug
Most rust stain removers come as heavy ready-to-use jugs that are mostly water, or as raw oxalic acid crystals you scoop yourself. The jugs cost a lot to ship and store. The crystals leave you guessing: the advice online ranges from a quarter cup to a full pound per gallon.
SpraySticks puts the exact dose in a stick that dissolves on its own. You add the water at home, the color tells you it is mixed, and the bottle you already own does the rest.
What is in it
The active ingredient is oxalic acid, the same acid that occurs naturally in spinach, rhubarb and wood sorrel. A small amount of wetting agent helps it soak into rust, and a little xanthan gum helps it cling to vertical surfaces like fences and siding.
It is still an acid and it is labeled as one. Wear gloves and eye protection, keep it away from children and pets, and rinse surfaces and nearby plants with water when you are done. See the safety data sheet.