Clean the tub right before you clean yourself
Shelley discovered it's easier to clean the tub when she's in it:
I am 7+ months pregnant with my second child and simple chores seem to be, well, not so simple anymore. Cleaning the tub, for example. With the belly bump it's hard to reach/scrub in all the grooves and corners. Finally, in desperation, a couple of weeks ago I climbed all the way in and cleaned the tub. I did manage to clean the entire tub but when I was finished I was more than a little wet. So, the next time I rethought and climbed in naked. I cleaned the tub and afterwards cleaned myself (showered). It is very simple and I find I clean the tub a little more often now.
(I also keep a hanger in the laundry room for when I empty the washing machine - to reach those one or two items stuck in the machine.)
My only addition to this hack would be to use non-toxic cleaning products. I'm a fan of Bon Ami cleanser for the bathtub.