Does anyone know what the blue stuff is that colours the soap in the commercial do-it-yourself drive-in carwashes? Stains your hands and clothes.
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Does anyone know what the blue stuff is that colours the soap in the commercial do-it-yourself drive-in carwashes? Stains your hands and clothes.
Its just blue dye, similar to what they put in regular washing powder. Only real purpose it has is to help tell who manufactured the stuff if something goes wrong & it needs to be tested - a LOT of different brands actually contain a generic product. As it isn't supposed to go on clothes in this case, they probably aren't really careful about which colouring agent they use.