Finance and Business Did Karcher buy Windsor? Did Karcher buy Windsor? In 2004, Kärcher purchased the Windsor brand from Castle Rock Industries, combining the Windsor product line with that of the global leader in cleaning. Related Posts:Are there dungeons in Windsor Castle?Can you turn off self cleaning on your oven early?How To Use Karcher Window Cleaner?Cordless Window Cleaners, Krcher, Best KarCHER Window Vac - Comparison Review 2021.Is Windsor Ontario good place to live?