If you have an electric toothbrush, you will be familiar with that disgusting brown residue that gathers all over. It forms on the handle, in the crack where the brush head connects and on the charger base – but what actually is it? What that toothbrush gunk is We spoke to cleaning expert Delah Gomasi, who told The Focus that gunk is a build-up of bacteria, saliva and old toothpaste that when exposed to the air, can turn a brownish murky colour over time. Yuck! “Too often I come across extremely dirty electric toothbrush holders. I’ve seen the worst of the worst, so I pass no judgement. I try …