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> They can all be made at home, with 3 or 4 ingredients.

I've done a few experiments with home made saponification in the past but I never really considered this for other cleaning products.

Can you share some resources or experience on this?

This is Lisa Bronner of Dr. Bronners which I used as a starting point:

There is also a girl who hasn't used any plastic for years and makes everything herself including beauty products:

Lots on Youtube in general. Again, I do it because I needed to, I don't want to preach or shame.