I use a Gatorade squeeze bottle when I clean my shower and tub. So I start high on the walls and scrub the shit out of the tiles with a brush. Then I work my way down the wall scrubbing and then eventually get the tub. Now you can turn the shower on and use the shower head to stream the shit down, but when the shower head can’t reach certain areas, what do you do? Whip OUT your Gatorade squeeze bottle, fill that puppy up with wawa, aim, squeeze, rinse, repeat.