Will soapy water kill lily beetles?

Moreover, how do I protect Lily beetles from lilies?

Drop into hot soapy water or use force to crush their shells. Inspect stems and leaves from all angles as the beetles hide in leaf crotches. Destroying this pest's eggs and larvae is equally important. Check your plants carefully at least twice a week, taking time to bend down and look under every leaf.

Beside above, does anything eat lily beetles?

Both adults and larvae damage lilies (Lilium and Cardiocrinum spp and hybrids) and fritillaries (Fritillaria spp.) primarily by defoliation, although in heavy infestations the flowers, seed capsules and stems can also be eaten.

The lily leaf beetle larvae, or grubs, cause the most damage. Hundreds of larvae may hatch at one time, and they begin eating immediately. Though the leaves are their preferred food, they will also devour buds, flowers and stems. Most feeding takes place under the leaves or at leaf nodes along the stem.