Good point. I'm not sure. The fogger is a cheap 700w Spirit model that we have had for years. I've never cleaned it, so there could be a lot of factors. I'll drag it out this weekend and take a look. I'll run a batch of regular juice and one with the scent to see what happens.Not to hijack this very useful thread, but could the scent additive have caused the fogger problems? I know that Froggy's states that their scents will not harm foggers, but everything I've read/heard about using fog scents says they're bad for the heat exchangers.