Dawn Power Dissolver will damage/tarnish the case if left on it too long. Hot antifreeze will damage anodizing. Methanol will tarnish an aluminum case. Metal bristle brushes will scratch/haze a shiny surface.

For me simple is better. A hot antifreeze soak is a pain to set up, monitor, disassemble the engine, etc. Dawn Power Dissolver is less of a pain but you need gloves and eye protection. Frequent engine wipedowns after flying sessions reduce the need for the more complicated cleaning methods.

Terry in LP