... ,no harm to human body and animals and plants,deep removing rust and stubborn stain.2)No damage to surface gloss,deep ... ,automobile,cultural relics,etc,;4)Rust and stain which burglar mesh,iron sheet roof,indoor and outdoor iron stand washed by rain leave ... long-term rest,especially humidity and leads to unsuccessful start,iron spot deep into stones,tiles,cement floor when flowerpot,metal ...