While many may say you *can* PW an engine as with any step I take I NEVER take the chance...
Look at it this way, what is pressure washing doing for you? = Saving time... What risk does using a PW pose? = Potential engine damage.... I think you see where I am going.
Least invasive method does not only apply to paint correction.
Again, many will probably tell you it's ok BUT I suppose it really is the overall thought process of the detailer that comes to the surface in this situation
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