X 10 on no blasting. It changes the surface forever, or at least until you can have the factory finish redone, which may be never. Maybe baking soda will clean without changing the surface, but glass beading makes it furry.
For a slightly different look, I glass beaded all the aluminum on one engine and then shot it with high temperature clear. Now it's a shiny gray color, but that's what I was after.

Gibbs Lubricant is entirely different from Joe Gibbs Driven motor oil. Here's a link: http://www.gibbsbrandlubricant.com/shop.htm

R.

Let's not forget Boeshield T-9. https://boeshield.com/products/