Muddy/Dirty/hard dirt

Whats the best way to clean the under-side of your truck after going off-roading, messing around in puddles ect. I have a power washer and i try to get the under side but after a day or so i look under and i see dirt spots. and what not?

So if people don't get my question.

Whats the best way to Clean the underside of my Truck So its clean, Not dirty?

 

elbow grease and a rag?

 

what i do, whenever i wash my taco, i get mcguiers (sp?) tire dressing foam spray stuff and spray my entire wheel wells with it, springs, shocks, everything, once it dries and drips off, looks brand new, however it uses almost the whole can for me to spray everything... you could try doing that for your entire under carriage...lol

 

Thats a pretty good idea. Anybody have anything bad to say about doing this?