You could try a good old fashioned plunger, if this isn't what you've already tried. This will then force whatever?s in there, out (hopefully). A good hardware store should stock them.
Our honest used car pricing is a little bit different to all the others. You can get to our values through make or model - you don’t have to follow a prescribed route. Plus, it’s live, which means we can react to changes in the market quicker than any printed price guide.