Underbody washing

[JohnS]

Atom-Mac in a garden pump sprayer after you’ve sparayed the car underneath with a hoze or whatever?

What would you recommend for underbody protection on a newish MX5 ND?

Anyone used/use Bilt Hamber Atom-Mac as a supplement to whatever treatment they’ve had done? Seems like a good idea to do fairly often. And it seems easy to do too as a maintenance clean under the car… Need to get chemical injector for the pressure washer though… Not sure doing it will a hand pump will get to as many places.