I have been using P21 for years on all our Porsche, Audi, BMW, Land Rover, Datsun and Subaru car wheels. It's a great product for cleaning. A large container works best for me so I don't spill. It sits in my unheated garage year-round, and New Hampshire is pretty cold in the winter, but it still seems to work. I also have a spray nozzle and haven't had any issues with it other than remembering to hang it over the jug so it doesn't drip off the product.
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