Battery corrosion

I use agm's in all my vehicles and have not had any corrosion on the posts. Clean the post and connector as desert captain said. Be careful not get any of the baking soda into the battery through the caps. You can buy a small can of battery terminal protection spray at walmart or just about any auto supply. If you spray the connector and any exposed wire thoroughly it works very well. Or, you could coat it with dielectric grease. That would attract dust and dirt, but at least it would not corrode.