Dawn + Vinegar + 1 Bottle=Magic in a Bottle! THIS REALLY WORKS. Some posts say to heat the vinegar, but I use the spray cold and it works great. Spray your tub/shower the night before you are going to clean it. The next day, I usually wipe it with an old shower scrubbie, but there is no need to scrub. Give it a hot rinse and everything will be clean and shining.
No space for shower supplies in your shower area? Try finding a mesh pocket holder and hang it over the curtain rod on the inside. Voila, instant storage space and easy access. Just throw the pocket organizer through the laundry whenever it needs it.