Mix up some of this homemade tub scrub and keep it in your shower. While you are in there, just scrub it around and your bathtub/shower will always be clean! Use 1/2 Dawn dish soap and 1/2 vinegar. Put it in a “dishwand” and shake it up. This works really well for shower doors also! No more getting on your hands and knees and struggling to scrub your tub clean!
I use the Scotch Brite Heavy Duty Dishwand for this job!