It means a whole lot of different things to different people. I have seen some which were actual solvent dip tanks - these are usually found at radiator shops. On the other hand I have seen a lot more of them that were little more than enclosed batch type industrial dish washers, using nothing more than very high pressure water, detergent, and heat. These second types are seen a lot more often at machine shoops. The real dip types will remove paint, coatings, and just about anything else. The washer types can also do a very good job, but more on the exposed surfaces than on interior areas (where the dip excels). Locally I have both choices not too far from here and within a mile of each other, which is very lucky. Look around and ask around.