[KING6]

Are you seariously that closed minded, feels like im replying to a mazda tech that designed the motor.

We use deisel fuel to clean parts at our shop. Parts that are on big rigs that get more dirty then any HLA could ever be. Everytime we do a wheel seal on a rig, We take it to our parts washer machine, wich is filled with deisel.. and it eats all of grime right off the bearings in seconds. (grime that the strongest brake cleaner, degreaser takes alot of, and much more time to clean)
It will work, I wash my hands with it when ever I get done with work and I have oily greasy spots soaked into my skin that soap will not remove. Id use a solvent, but that crap drys your hands out. Desiel just leaves a smell.. wich goes away after washing your hands a few times.

All I know is mine work like new, Ill continue to do it like Ive done it in the past.
It doesnt matter if there not getting the pressure, or not holding it,, or a combination of that. They need to be cleaned.
But so does the rest of the motor.
Far as i know, from my expereince, they dont get caked brown inside like the rest of the motor. And that, requires a few hrs in the heated/enclosed parts washer.