Alcohol. Sit in a bath of alcohol. swish it around to use the liquid to "scrub" the port.
You have to get it exceptionally clean, because of the sugar in the sauce, and the close spacing of the connectors. Sugar carbonizes if current goes through it, shorting everything.
So wash it in a few ounces of alcohol (plain old 70% rubbing alcohol) for a few minutes, replace the alcohol, wash again ... keep going until a strong light and a magnifying glass shows a clean port - not a spec of dirt. Then wash it twice more to be sure.
Let it dry for a few hours before you plug anything into it. Alcohol absorbs water, so it should dry the port, but it can't be too dry.
And hope that by trying to charge it with sauce in the port, you didn't already damage the port. (Although having the port replaced in most phones isn't terribly expensive.)