The ladybug cleans the antennae with its legs. The legs have fine hairs and sticky pads which enable very delicate, but thorough cleaning. Ladybugs, also, have a second pair of sensory organs that look like another smaller pair of antennae. These are called palps. They are highly sensitive structures and enable the ladybug to push food into its mouth.
Ladybugs have two ocelli, or simple eyes.
They see by photoreceptors, which means their eyes only process light and dark images. They don't see colors, only shadows. This fact makes use of antennae all the more important. Beetles exhibit bilateral symmetry. This means that the left and right sides of the body are mirror images of each other.