Multipurpose liquid option
For most of the dishes, you can simply use a Dr. Bronner’s Castile bar soap or liquid soap, with hot water and a soft scourer.
Solid dish soap
The solid dish soap from Anemone et Basilic works very well.
You need a dish to keep it, and if you don’t have one already, you can buy one from the website, or buy a simple white and blue metal bowl from the kitchen shoppe on Lavender Hill, it fits perfectly. (If you buy this dish soap, consider buying their solid shampoo at the same time. It works very well).
Refillable liquid option
If you prefer the liquid option, buy washing-up liquid in bulk from the Source, or 5l container from Ecover or another green brand, pour what you need in a 1l bottle and refill as needed.