What is the ruling on selling cleaning products whose concentration has been diluted with water without the buyer's knowledge, or with their knowledge of only the new concentration, and what is the ruling on working in a factory that does this?

If the reduction in the concentration of materials is intentional, such that if the buyer knew about it, he would not have purchased the commodity or would not have purchased it at that price, then it is considered prohibited deception (ghish). It is not permissible to sell a commodity with a reduced concentration unless its true nature is explained to the buyer. Likewise, questions related to the origin of the goods must be answered truthfully and without deceit. As for working in the factory, it is permissible if it is not involved in deceiving customers; otherwise, it is not permissible.