Keep your couch as new

To keep your couch as new it's not enough to prevent stains.

Leather couches need a clean with a damp cloth now and then and faint spots can be treated with leather oil. Never use too much.

Fabric couches accumulate dust, si it's important to vacuum them regularly.
Most vaccuums have a special mouth to do so.
Give special attention to the corners.

Smelly spots do well with a rinse with a cloth with a few drops of vinegar.