I cannot believe that eggs are washed anywhere in the world!
And yet it is thus. And since foreign pilgrims in Spain may be puzzled by how eggs are stored by Spanish supermarkets or by their fellow European pilgrims in albergue kitchen, albergue fridge or mochila, here's something from an official (EU Commission) report. It is ten years old, so perhaps a bit outdated but it sheds some more light on this abyss between the various egg-producing and egg-marketing countries and their consumers of eggs.
Note: EU Class A eggs may not be washed. Other EU eggs may be washed before they are sold, they are just a different class egg then; a washed egg is a downgraded egg. And look at what Sweden does!!! Luckily, all these washed Swedish eggs have to stay within their national borders and must be eaten in Sweden and will never reach Spain.
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4.3. Washing of eggs
The practice of washing eggs of class A for human consumption is forbidden by the European Union legislation. A fresh egg of class A should be produced in a way that ensures it is fit for human consumption. Washed eggs should be downgraded. This is in contrast to certain third country attitudes, such as USA, Japan and Australia where washing of eggs is commonly practised.
Among the Member States, it is only in Sweden that table eggs are commonly washed, in order to meet a consumer preference. Even in other Member States, like UK and Italy, the consumers may have the idea that a washed egg is safer. This idea in the mind of consumers has emerged as a consequence of repeated food poisoning cases, caused by egg-borne Salmonella enteriditis and media campaigns on this subject. The increased use of alternative systems and the consequently higher percentage of non-cage eggs available on the market may produce a higher number of dirty eggs. These dirty eggs must be downgraded and sell at a lower price, which causes a loss of income to the producers. This explains why the washing of eggs still attracts interest.