An interior cleaning company specializes in the upkeep of cleanliness inside buildings or on building grounds. If this service is performed by the company which provides repair and other maintenance services, then it should be listed as a janitorial service or facility management company.

The service specializes in cleaning. Building grounds are included alongside interiors, despite the role's short name.

When the same contracted service also provides repairs and other upkeep, the broader janitorial or facility-management role applies. The cleaning-only scope establishes this separate classification.