#1:

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Soak a cloth or sponge in some warm soapy water, then squeeze out the excess water and wipe your windows using a circular motion. Repeat in order to remove stubborn dirty stains, regularly rinsing the cloth.

#2:

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If you don’t have a Windomatic and want a fluff-free shiny finish, try using a synthetic chamois, equipped with a special coating with micro-pores which significantly improves drying performance. Simply buff windows in a circular motion to leave a shiny streak-free finish.