Remove rust stains on stone

What you need:

• Rust stain remover
• Ascorbic acid
• Oxalic acid

• Rust stains on stones can have many causes. Even if you leave iron objects lying around overnight, rust stains can appear in damp weather. Use water with a high iron content for gardening (for example iron-containing fertilizer), this can also leave extensive rust stains on stone. If you handle such water carefully, you save yourself time-consuming cleaning work.
• Brush off the surface of the rust stains. However, do not use a steel brush to avoid transferring other rusting parts from the steel brush to the stone.
• To remove iron oxide stains, you need an acid such as that available in the form of stone cleaner in hardware stores. It loosens the rust from the stone surface so that it only has to be removed mechanically. Ideally, you should use an industrial vacuum cleaner for this. Depending on how strong the detergent is, you will have to carry out several operations.
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• To remove a small rust stain, rust remover from the drugstore, which was originally intended for laundry, may also be suitable.
• A simple and effective remedy is ascorbic acid, which removes oxygen from the iron compound. You can get them in the pharmacy. The powder is simply applied wet to the stain and rinsed off after a few minutes of exposure. This process may have to be repeated. Oxalic acid works faster, but it is slightly toxic, so you should be careful when applying it to the rust stain.


Remove rust stains on concrete - this is how it works

Brown discoloration occurs when iron oxidizes. The rust pulls into the fine pores ...

• Depending on the nature of the stone, rust stains are differently difficult to remove. Unsealed marble, for example, is a very soft rock and very prone to staining. At the same time, there is a great risk that you will damage the stone while cleaning. In the event of severe damage, the top layer must be sanded off and resealed. In any case, you should leave this work to a specialist company.