Quote Originally Posted by mjr350 View Post
I was under the understanding that high pressure pushes sand and salt further into cracks and crevices where as low pressure high volume washes the salt away. Non salty sand is ok after the salt is diluted and washed out.

While i understand the benefit and the reasoning behind simply diluting the salt (and that's good) I want to remove "everything" that was not there before the trip, I can see how high pressure into seals etc could push water/contaminates , but you don't hold the blaster point blank pumping water into any one spot near a opening, I doubt it would be much worse on seals than hitting a puddle at speed.

As a experiment, when you car is really dirty, hose your paintwork with a low pressure garden hose for a hour and see what residual contaminates are still left, in comparison, hose your paintwork with a decent pressure washer and most of the time, it will be almost clean in 5 min, when you think about it, the same contaminates are all under your car (if not more) so unless you also get under the car and wash your underbody/chassis/diffs with a sponge then rinse, I cant really see how you are removing much of anything, low pressure hosing may eventually dilute the salt ,but does not really "clean" the underside of your car good enough IMO.


Quote Originally Posted by megatexture View Post
I might just test it then lol .

Steve if your using a better pressure cleaner than a car wash bay or a kartcher or a gerni that uses a petty 1000psi@8 ltr per min it may be like the one I use for work that uses 3000psi@25 ltrs per min.
If using a 8 ltr job its best to put a sprinkler under the car for 30 mins to remove all the loose sand before washing.

Yeh, ive also got a little domestic Gerni, its way better than a hose, but does not get all the crap off either, it will draw blood if you hit your arm at point blank range as I found out the other day (almost healed now, haha)

I think the one I use is about the 2000psi@14 (but don't quote me), never used a 3000 Troy, but you want to be careful when testing as im sure you could also have too much pressure and start wrecking stuff at close range (lol)



What do you guys do after a "muddy" 4wdriving trip if you don't use pressure ?