To keep this from happening, it is important to prevent lady beetle infestation. But because they are such useful insects, it’s best to use physical exclusion methods to keep them from getting in. For instance, you should seal the cracks in and around your doors, windows, siding, pipes, and electric cables and fix any broken screens. If they manage to infiltrate anyway, sweep them up with a broom and release them outside, as far from the house as possible.
If effective sealing is impossible and you can't stand having them in your home, you can apply Maheu&Maheu Insecticide Dust to cracks and gaps and under your siding. This should be used only as a last resort because, after all, lady beetles are very handy to have around!