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The anti-seize is fine, and recommended to prevent the plugs from seizing into the aluminum head. Dunno where others are getting impression not to use anti-seize on aluminum heads. I have used in ALL cars for over 20 years and no problem.
The only thing you did wrong was spraying the brake cleaner into the plug hole- egaaaad! What on earth was that about??
The brake fluid is not designed for the combustion chamber. Doubt if you damaged anything - however, may had screwed up the 02 sensors?
However, as long as you aren't throwing your CEL- the 02's are likely A'OK.
Suggest a good old fashioned "italian" tune-up ?
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