If the decorative rocks in your garden appear "rusty," then you may have a problem with iron in your water or the rocks themselves may contain iron that is rusting when it gets damp. Either way, the rust is generally unattractive and you likely wish to remove it so your garden decorations are once again beautiful. A simple solution of wood bleach and some extended cleaning time will be necessary in order to get your rocks looking bright and colorful once more.
Things You'll Need
- Plastic tub
- Oxalic acid (wood bleach)
- Rubber gloves
- Plastic scrub brush
Rinse off all your rocks. In many cases, at least some of the discoloration is due to dirt, so rinsing off the rocks will help you determine how serious a rust problem you actually have.
Mix up your wood bleach solution. Wood bleach comes in a powdered form and is mixed with water to form an oxalic acid bath. Refer to the manufacturer's instructions to determine exactly how much water and powder to combine in the plastic tub.
Submerge your rocks in the solution. They will need to remain in the bath for several days. Be sure to store them out of reach of children. Wear your protective gloves when submerging them.
Rinse the rocks under running water. In the case of mineral specimens, you may wish to leave them under running water for a few hours. In the case of decorative rocks, however, you can just rinse them thoroughly for 30 to 45 minutes. Wear your protective gloves while you are rinsing, and use the scrub brush to remove any stubborn stains that are still on the rocks.
Sand off any "sticky" rust stains. If your rocks retain any stains after the oxalic acid bath, then you may need to sand them off using a fine grit sandpaper. Use light pressure and monitor the progress of the removal closely so you do not remove any more of the surface of the rock than is absolutely necessary.
Tips & Warnings
- Hydrochloric acid will also clean rocks, but this acid is less common and more complicated to use than wood bleach.
- Always wear gloves when dealing with oxalic acid and avoid inhaling the fumes.
How to Clean a Rusty Skillet
Don't toss that pan - a little elbow grease (and some real grease) is all it takes to bring a rusty cast-iron...
How to Remove Rust Stains From Ceramic Tile
Ceramic tiles are made from refined clay and other material. Maintenance is important through routine cleaning with mild soap and water. If...
How to Prevent Rust
Rust is a type of corrosion that affects metals like iron and steel which are categorized as ferrous metals. Typically rust will...
How to Remove Iron Stains From Clothes
An overabundance of iron in your water supply can cause it to turn a rusty red. If you are caught unawares, the...
How to Clean Rust Off of Marble in a Shower
It is easy to spot a rust stain on marble. It shows up as a perfect circle under the shaving cream can...
How do I Remove Green Algae Stains From White River Rock?
Green or black algae stains tend to be common on stone or concrete exterior surfaces, especially in humid climates and where shaded...
Paint Colors That Go With Rust Colors
Paleolithic cave painters used red clay and iron oxides to cover rock walls with enduring rust-colored art. Rust has always been an...
How to Remove Rust From Granite
Not even granite is safe from rust, despite the fact that it is stone and not metal at all. Remove rust from...