Take a recommended cleaner wet the area with it
Then take a small piece of paper towel moisten this with the cleaner
Put it on top of the already wet area.
Then take a small piece of plastic wrap and place it over this poultice
Let it sit for a couple hours
The idea is to let the cleaner soak in and do it's job without drying
Then use a toothbrush to clean the area
Always try this on a small out of the way area first just to make sure it does not have any adverse affects on the finish
I have done this many times on dimpled finishes and also to remove stubborn stains from a variety of materials.