Autoglym Polar Blast is a concentrated snow foam pre-wash, supplied here in a 2.5L bottle. It is pH neutral, and Autoglym states it does not remove previously applied waxes or sealants and can be used on matt and satin paint, so it suits protected cars as well as regular maintenance washes. Applied through a foam gun on a pressure washer, its thick, high-cling foam loosens dirt and heavy soiling before anything touches the paint, which reduces the risk of scratching during the contact wash. Autoglym's testers recommend 1:5, or 100ml of product to 500ml of water, with a working range from neat to 1:10 and a dwell of up to 10 minutes. Follow it with a shampoo contact wash, a clean wash mitt and a microfibre drying towel.