What's a home remedy for Mealy Bugs on my houseplants?

Mix water with power soap (laundry detergent) mix it then apply with a sprayer bottle!!!

Dish detergent works too, just dont make it too strong with the soap. approx 10-1 ratio.

Best if you can dip the foliage of your plant in the soap water in your sink. That way you get the whole plant. If you use the sprayer method, keep doing it on multiple days until you don't see the bugs any more. A good idea to repeat again a week or so later. If you have any other plants near infected plant, spray them too. Except those not water tolerant on their leaves (e.g. African violets). Even better if you can isolate infected plant.