In most cases, it's not necessary to remove the seats for routine carpet cleaning. Modern cars are designed with accessibility in mind, and you can usually reach all areas of the carpet without seat removal. However, for extremely thorough cleaning or if you're dealing with significant stains or spills that have seeped beneath the seats, removing them can provide better access. Keep in mind that seat removal can be complex and may require specialized tools, so it's advisable to consult a professional if you're unsure about the process.