Like, say, a low pressure water supply, limited to 900L a day.
There's a reason we went with scraping the solids off, then soaking the nappies. It wasn't a lack of wisdom.
Wisdom is why we used a washing line instead of a dryer, as the UV in my country is amazing at removing the left over stains.
It's also great at giving people with a Northern European heritage skin cancer, so you know, upsides and downsides.