I have looked at the patents referred to in the Greenshield website and I am unable to find any real purpose for including ethyl palmate. Most of the examples given in each of the patents do not contain the material and in those that do, the amount is very low.
The patents are fine examples of obfuscation and demonstrate (eventually) comletely unrealistic formulations.
In the LOI of the quoted product thus:
Water,
Acetic Acid (Organic),
Ethyl Alcohol (Organic),
Cyamopsis
Tetragonaloba Gum (Organic Guar Gum),
Fragrance (Organic),
Sodium
Hydroxide,
Sodium Carbonate,
Calcium Chloride,
Ethyl Palmate (Organic),
Silica
Note that acetic acid reacts with sodium hydroxide and sodium carbonate; sodium hydroxide and sodium carbonate react with calcium chloride.
So, what is there in the final mixture?
Sodium acetate - something granny may have used as a cleaning agent (formed from vinegar and sodium hydroxide and carbonate), possibly sodium palmate (soap) from the decomposition of ethyl palmate by sodium hydroxide.
The key ingredients of each of the patents is soapberry or soapberry extract. This is strangely missing from the pack LOI in the link you gave.