The best way to reduce waste is to have things that can do multiple jobs. I mean you do not need one thing or product for every single task you undertake.
I absolute love this three ingredient recipe I discovered that works as a dishwasher tablet, shower and tub cleaner, toilet cleaner, floor cleaner, silver clean, I even pop into the washing machine when I run out of laundry powder.
I cup bicarbonate soda
1/2 container citric acid
1 Tablespoon dishwashing liquid
(you can also add essential oils like orange to give extra lift to grease or tea tree to kill germs)
Add bicarb and citric acid to a bowl, mix together.
Measure one tablespoon dishwashing liquid (do not add extra) and add to bowl, mix together.
(add serval drops of essential oil here if you like)
Push mixture into ice-cube moulds.
The mixture will rise a little (more if you added too much liquid) scrape extra off and push into another mould.
Set moulds aside and allow to dry overnight.
If you do not have a mould you can use the crumbled mixture as it.