This isn't a new swap for a smaller footprint/greener life but something I've been doing for ages.
This is what I use for cleaning the sinks, basins, oven and down the drains, it works a treat and no nasty chemicals into the septic tank. This new big ol' tub is a cheap way of buying it and as it's a Food Grade Bicarb it can be used if needed for cooking too. I can't remember when I last bought a tub so this amount must last about 6 or 7 years. The pot I store it in on the kitchen window sill is one of my favourite bits of old kitchenalia.