You cannot just kick them out. You must lock the door behind them. Seal your home like a bank vault.
Check all window seals for gaps. Ladybirds can squeeze through a crack as thin as a credit card. Use silicone caulk to fill the gaps. It is cheap, easy, and oddly satisfying.
Pay special attention to roof spaces and lofts. Harlequins love a good, dusty attic party. Check under the eaves. They are master ninjas of infiltration.
The Light Bulb Ambush
Ladybirds are drawn to light. It confuses their tiny brains. At night, they cluster around your warm, glowing lamps.
How to GET RID OF LADYBUGS IN HOUSE - YouTube
Here is the funny part. Turn off your main lights for one hour. Then, switch on a small desk lamp near a window. They will fly to the lamp, get confused, and then notice the open window.
They become hypnotised. They will fly out into the cold, dark night. It is a magic trick you can perform for free. You are now a ladybird whisperer.