Any undercarriage coatings or waxes that you guys use?

[AuroraDetailing]

When I was living in Australia, I wasn't doing any detailing but happened to get a small Karcher pressure washer and an undercarriage attachment that had spinning sprayers that you could roll under a car and spray the undercarriage. It came with a solution bottle to add to the spray and a sample of some undercarriage wax. I haven't seen any similar products in the US and was wondering if anyone does a service like this. Of course a spray wax isn't going to be as effective as a professionally sprayed coating, but that's not something I want to get into, nor is it a mobile service. But just spraying a decent wax for this purpose could still provide some protection through the winter and could be done a lot cheaper and applied as often as necessary. So has anyone here done any of this and could recommend some products?

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[KneeDragr]

I have one of those attachments and it works good for cleaning off road salt during the winter. I also use it if Ive driven over dirt or gravel roads. In the winter I use SaltX APC to clean, otherwise Optimum APC, then follow it with their wax. I stocked up on the wax when I bought it, got a case of 12. Im 2 bottles in after 3 years.

Its just for personal use, I dont do professional work.