I haven't found a great chemical to use, my greatest strength was in the scrub brush that I chose. Also soaking in dawn concentrate helped tooWeed eating is a lot easier if you get a padded shoulder strap to help hold the weight of it up.
Cleaning the tub is a lot easier if you keep a long handled scrub brush or a plastic bristle broom that you don't use for anything else to scrub the bottom of the tub with so you don't have to get on your knees.
If anybody figures out how to make dishes easier let me know. Best I can do is say use lots of baking soda to scrub off glass/ceramic pans with grease cooked onto them.