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According to Meguiar's, it is just a by-product of the chemistry. It does not affect performance whatsoever.

The diluted product along with the undiluted product is stored in a dark closet. What is strange to me is it's only the diluted product that turns brown. The undiluted jug has never turned brown, and the undiluted product is still blue. I use distilled water and dilute 10-1. I have reach out to...

Does anyone know why Meguiar's D120 Glass Cleaner Concentrate turns brown, and the bottle turns brown, after being diluted? This occurs approximately 3-4 weeks after being diluted. Does this mean the product has turned bad? Will this create problems if used on clear plastics? Will this product...