I'd be worried about flushing an aggressive acid through an aluminium engine. The main constituent of brick acid is hydrochloric acid, mix that with ally & you end up with lots of hydrogen, water & salt. It might be something I'd consider if I had a problem, but not as a routine treatment.
Just IMHO of course
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Rule#3: Tha' can't educate pork.
Rule#4: See rule#5