Carpet stain remover spray. Person spraying stain removal chemical onto a carpet. Stain removers often contain organic solvents such as butoxyethanol to dissolve the stain. Solvents are classified as a hazardous substance. Light exposure can cause irritation to the mucous membranes, eyes, nose and throat. Heavy exposure through skin contact, ingestion or inhalation can lead to serious health problems and possible death.