Best Practice question - washing

[Centexhokie]

We are in the "rainy season" here in Texas where we get 1/2" to 3" rain it seems like weekly. My car is waxed with Collinite 845 and my wife's SUV has Griot's garage sealant both recently applied. With the rains we get hundreds of tiny dirt droplets on the sides as the splatter from the road beads and then the water evaporates.

My question is what is the best practice to washing that splatter off. I have a foam gun with CG Honeydew, two (2) buckets and a mitt or would it be better to use my power washer and blast the dirt off. or... how do you do it to minimize the paint impact on the daily drivers.

I am going to put on the Pinnacle Black label coating and the sealant shortly so I don't know if that might change your answer.

Thanks in advance for suggestions.