I used the Ryobi under carriage washer today and it worked like a champ with a 1600psi machine.
Now granted my car is low so the spray is effective. Might be stretching it to use on a truck.
The wheels are 5" so there is that limit for low cars.
I have been using Megs Hyper-wash lately and all I can say is WOW. I feel like an idiot for waiting so long.
It works beautiful on CQUK3 cars. My new soap for everything.
I bought it to use as a wheel soap and just kept going.
It takes so little for bubbles and slippery soap.
This goes back to ELDO talking about Optimum car wash vs Hyper-wash. Now I see he is totally correct.
I forgot about that I got a whole gallon around here somewhere.