The hot wire doesn't work well on this type of glass channel - just becuase the clips get in the way - a hot (electric) knife tool is better for Challengers (imagine a hot knife through butter). The glass guys have both tools. I used a cold knife myself (now imagine a cold knife through cold hard butter...). Either way, make sure you have the sealer cut completely away - don't try to pry or push the glass out - it'll break on you!