HELP! Advice needed for a job

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Ok, I do not post here much, but I know I can come here for help from the PW Pros!

I am a Mobile Detailer, and recently was contacted to wash a few Big Rigs, minus the flatbed trailers. They want the gas tanks and other aluminum cleaned up a bit. Not polishing, just cleaned up. They said the previous guy used an acid?

So here are my questions:

1. What can I use for the Tanks and other Aluminum Surfaces?

2. What can I use to wash the truck? Something strong and effective, yet safe for all surfaces on the truck.

The previous person taking care of these trucks out of state was getting $50 each. Sound fair?

I have never done a Rig before. I am used to cars, boats, and RV's.

Any help would be appreciated!

-Chris W.

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Here are a few pics of the trucks.....