Power Wahser to Clean Rear Radiator

I have asked two Cat dealers about extending the slobber tube and they both had never done it and did not recommend it. Yes, I have read the threads about doing that but I want to be sure it is done correctly. Yes, I know that the way the slobber tube is now, it is blowing gung onto the radiator which is why I would like to do this more than once per year. This last trip, we went up and down a very steep mountain and blew gunk all over the toad and the back of the coach so I am sure the radiator got hit as well.

Talking to the mechanics, it takes a lot to get through the radiator and the CAC to clean off the gunk. They have steam cleaners at high pressure to do the job.