Thanks @Chippy_Tea.
What exactly is washing soda though? Is it just just this sort of thing?
https://www.tesco.com/groceries/en-GB/products/285047163
The forum doesn't allow direct linking to Tesco is the picture below what you linked to?
Sodium carbonate, Na2CO3, (also known as washing soda, soda ash and soda crystals, and in the monohydrate form as crystal carbonate) is the water-soluble sodium salt of carbonic acid. It most commonly occurs as a crystalline decahydrate, which readily effloresces to form a white powder, the monohydrate.
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