DeOx gel is sitting on my shelf. Not sure how good it is, but you might like to check out its reviews?
I don't know about baking soda but recall something about using wall paper paste to make a gel from rust remover / converter.I was just thinking of how to attack the rusty parts under the car,
I've heard you can mix baking soda and lemon juice to make a citric acid paste ,paint it on and let it sit for abit
Any one tried that?
cillit bang is the sameMy friend who does motorcycle valeting, swears by this.