Discussion
Which cleaning approach addresses a fouled valve?
Answer: D
The deposits are hard tar and need mechanical removal. The last option explains exactly why, which makes it a correct and more practical version. Induction cleaning helps with lighter deposits. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.
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