Hjul also makes an excellent 'fallout remover' for removing iron deposits on bodywork. Usually, these would be clayed off, but some like to use chemical fallout removers instead (or after the claying stage for the ultimate decon regime). To use in this way, simply spray on to the bodywork, allow the colour change to occur and rinse thoroughly - especially around any brightwork or metal trim. Never let it dry onto metal trim, or dwell too long on these delicate surfaces. Whilst it is pH neutral it could stain sensitive finishes if left unchecked on them for extended periods of time.