You can wash the dishes with castile
soap or eco friendly biodegradable detergents. Like from Ecover and Weleda.
Look at the ICNI ingredient list of your dish washers and shampoos.
The detergent they
should have, should be only decyl glucoside, coco glucoside or lauryl glucoside. These are biodegradable detergents that readily degrade in the grey water to organic molecules and are also mild for the skin and eyes. They are produced from vegetable oils treated with some chemicals (not not "bad" ones).
Castile soap is just soap produced from lye and vegetable oils, it is the most biodegradable and natural option, but it is a salt and is alkaline.
Anything with sodium lauryl sufate (or laureth or dodecyl), cocamidopropyl betain (or coco betain), is not biodegradable and should NOT be used. They are also irritant for skin (or toxic).
Our projects:
in Portugal, sheltered terraces facing eastwards, high water table, uphill original forest of pines, oaks and chestnuts. 2000m2
in Iceland: converted flat lawn, compacted poor soil, cold, windy, humid climate, cold, short summer. 50m2