Bob, I use Dinitrol. I have aerosols and that makes it easier then a Shultz gun. I use a hose attachment with a swivel head to wash the underside when puddles are not available. I am planning to clean up the car whilst on axle stands soon too. Wheels off and full clean.
Looking to get new tyres soon and may get the alloys refurbished as the inner surfaces are starting to suffer.
I also make sure the car is DRY before Dinitrol is used. Warm air drier moved round to cover the whole underside.
