Engine shampoo vs liability

Couldn't this be avoided if you just hit the motor with a leaf blower immediately after you lightly spray the engine bay?

That has what I have been doing. I'll cover any critical parts (aftermarket intake for example) and then spray degreaser, let sit for about 20 seconds and then spray water lightly on the motor, after I see that the motor is dirt free, I'll quickly take a leaf blower and blow the motor dry.

In my case, the engine intake and such is covered with a big piece of plastic. That hid the spark plug well which was full of water.
 
I've only done one engine shampoo since I opened up shop this spring. The car was a Lexus IS 360 I beleive that the customer imported from japan and it had a huge engine. I degreased it and rinsed with water, dried it out and dressed all the black rubber and plastic. When he started the car to leave it was idling rough. I told him it was just because of the water and told him it would go away when it dried out. I haven't heard from him since. I haven't done an engine shampoo since, except on my own vehicles. I'm not sure how one would present a customer with a waiver to sign, without scaring the customer?
 
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