I would go with Meguiars APC & Meguiars Super Degreaser. If you are looking for just one, go with the APC, you can dilute 10:1, and I've even heard of 12:1. Very economical and effective! I haven't found much it doesn't take care of at the right dilution ratio. It will even take care of 95% of what the degreaser handles, just takes a few repeat applications.
Megs APC+ or Optimum PowerClean here. I got PowerClean in a local trade. When comes time for refills - the cheapest per diluted ounce will be my purchase.
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