No, it's not rocket science but, many of us have to do it. I admit... I don't clean my makeup brushes nearly as much as I should. If you plan for it, it really is easy enough to do once a month. All you need is some baby shampoo and a couple of towels. And your makeup brushes, of course.
Lay one of your towel down on a flat surface and roll up one of the ends.
Better view of the rolled up towel.
Take a brush and run it under some warm water.
Put it in a little bit of baby shampoo, I squeezed way too much on my hand but it was fine. You won't actually need this much.
Swirl the makeup brush around on the palm of your hand and rinse.
Repeat over and over.
When there is no more lathering on your hand, the brush is clean!
Squeeze as much water out as you can between your fingers.
Then do the same again with a towel.
Reshape the brush.
Lay the brush on your rolled up towel- the handle on the roll and the brush on the flat part of the towel. This will allow water to fall away from the handle rather back into it.
Repeat on all brushes! Let them dry overnight, AKA a while. Sometimes your bigger brushes will need to dry for a whole day. Easy peasy lemon squeezy.