Not sure what to tell you for long time soap scum build up short of Soft Scrub and good old fashioned Elbow Grease!

However for mold, mildew and keeping your shower clean with minimal work, try Clorox Clean Up and a squeege.

I HATE scrubbing my tub/shower too!

Once you get your shower clean it's easy to keep it that way though.

After every shower: rinse down ALL the soap residue, and use the squeege to get the worst of the water off the walls and sides of tub. Trust me, those extra 2-3 minutes pay off big time later. Using a fan, opening a window or turning on your vent for about 20 minutes helps speed drying time and thus prevents ALOT of the mold from forming. Keep your shower curtain pulled across and as least folds in it as possible, gives less places for mold/mildew to form.

Once every week or two (depending on how much mold you get) just spray the Clorox 2 on everything, even your shower curtain on the inside, open a window or turn on your vent, close the door (you want to keep the pets out and the bleach smell is a bit powerful), and let it sit for 20-30 minutes. Go back in, rinse down everything with hot water, squeegee it down the drain. Again keep your shower curtain pulled across and as least folds in it as possible. Keep fan/vent going or leave window open until totally dry then you can open the door again without fear of pets drinking any standing water left and your tub/shower is now clean as a whistle with NO scrubbing.

I don't have a vent in my bathroom, but I do have a window in the shower itself and I put a fan on top of a cabinet so it blows over the curtain rod and out the window to make drying time faster. About once every few months I do take Soft scrub to the tub only but I don't have to scrub, more like a quick wipe down and rinse.