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I decided to go first with finishing up the inside of rims since inside looked like garbage and could ruin/contaminate the front side if done later.

I started cleaning insides using soapy woader...

I just bought a set of old Civic Aluminum 14x5.5J rims and they have a lot of oxidation and even some biological growth on the surface. Here is a picture of a rim before the restoration.

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I did not see any erratic idling in today's cold start either. I am quite happy with the results and with saving my self $550 CAD for other stuff :)

Here is an update, I used a bottle of Gumout all in one cleaner in a full tank of 87 octane gasoline (sorry, i could not find any techron locally) and drove 2 hours continously on the highway around...