美国采购需求：激光清洗机

I need assistance with removing rust from wrought iron stair railings on two porches before I repaint them. I'm considering using a laser treatment, but I'm concerned about the potential damage to the carpet on the porch steps. Could you provide more details on how the laser works and if it poses any risk to carpets during the rust removal process? Additionally, I'm looking for recommendations on the best methods or alternatives to ensure a safe and effective cleaning. Thank you!