Windex would not be considered "sudsy ammonia" from the research I've done. The key ingredient would be a detergent. Hence the dish-soap. The detergent give the mixture a foamy or sudsy effect when applied to the object.

MP, have you found that the filmy reside causes any type of oxodation or degredation? I wonder how critical it is to rinse the object after using the concoction.

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German Sabers