For this I am using the Karcher Chassis Cleaner. This is a very useful tool that connects to your Karcher power washer. It's on wheels, so it easily slides under the car, allowing you to rinse the underneath using pressurised water, you can then use the dispenser to apply snow foam, shampoo, sealers etc etc.
It's no replacement for getting under the car with a toothbrush and undersealing the car, but it's a massive help for regular washes/rinses. The M3 used in this video has had a light underside restoration, so with it being so clean, regular use of the chassis cleaner allows me to keep onto of it.
I am also aware there are two camps when using "snow foams". Some people believe in rinsing before and some people don't. Naturally feel free to apply in the order / methods you see fit.
Products used (to make it achievable by all) were AutoGlym Polar Blast and AutoGlym Polar Seal.
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