How to Remove Rust Stains on Vinyl Siding

Keep vinyl siding rust-free.
Keep vinyl siding rust-free. (Image: industrial siding image by Steve Johnson from Fotolia.com)

Popular for its longevity and low cost, vinyl siding also doesn't require much care. Rust stains inevitably occur, however, especially when air conditioning units or certain types of drainage pipes are installed against the siding. Acid-based solutions are the commonly preferred method for reversing the effects of oxidation, which causes the rust stains.

Things You'll Need

  • Garden hose
  • Lemon juice or white vinegar
  • Water
  • 1 tbsp. oxalic acid crystals
  • 1 cup warm water
  • Nylon scrub brush
  • Ladder (for reaching higher rust stains)

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Spray the rust stains with a steady stream of water from a garden hose.

Attack stains by first spraying them with water.
Attack stains by first spraying them with water. (Image: hosepipe and tap image by david hughes from Fotolia.com)

Mix a solution of 1 tbsp. oxalic acid crystals with 1 cup warm water.

Scrub the rust stained area with a nylon brush dipped in the solution.

Rinse scrubbed area with garden hose and blot dry with a clean rag.

Tips & Warnings

  • Wear rubber gloves and protective eye gear when applying solutions.
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