Use a Sparging Bag

Consider a sparging bag for those indoor brews. These bags make steeping or partial-mashing (or even full mashing) a breeze because they're coarse enough to allow water exposure to all the grain, fine enough to prevent any grain from sneaking into the wort, and equipped with a drawstring for easy rinsing/sparging. You can also clip it to your kettle with binder clips and avoid any hassle of it sinking into the wort!