It's a combo actually.
Comet spray (lavender scent) and a plastic scrubby pad (the ones that look like brillos). I bought them originally for the kitchen but thought what the heck. Awesome results! No scratching, less scrubbing than with a brush and the rinse super clean! I get the. At dollar tree. 2 bathrooms once a week they last about a month. But at 6/$1 it's pretty good.
I have to admit - we need to re-grout a bit if our master shower - it's a little stained so I used a little Clorox bowl cleaner on it with an old toothbrush, not perfect but much better. It's getting re-grouted this summer.
I even had enough energy left over to wash the painted walls and wipe the ceilings down. When we renovated the bathrooms we opted for un-sanded ceilings (unlike the rest of the house) and we went with washable bathroom paint in a satin finish. Whew - super smart. Now here are 2 rooms that are spring cleaned ready.