Wire brush and a little brake cleaner afterwards works well. Just make sure you don't get the dirt down the oil or coolant passages or alongside the piston. Rotate two pistons to TDC for cleaning, then do the same for the other two.
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2009 Corvette Z51-SOLD
1992 Mitsubishi Eclipse GSX-SOLD
2013 BMW Z4-Current summer hooptie
2017 GMC Yukon-Current winter hooptie
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