Upholstery cleaner is often a high-foaming aerosol designed for broader applications like floor mats, carpets, and the delicate roof lining (headliner). The foam helps lift dirt to the surface where it can be wiped away, minimizing the amount of moisture that penetrates the material. This is crucial for headliners, where too much water can dissolve the glue holding the fabric to the roof. It is effective on salt stains and mud.