great if you want a slime factory but there is a cure [SEP] despite rinsing and wiping the exterior of this unit after each use a pool of slime soon forms in the charging base it is even worse inside the top of the handle visible when the brushing element is unscrewed if you want to avoid a disgusting mess you really need to disassemble this unit every day for a thorough cleaning that is a lot to ask for a tool that is supposed to make our lives easier i used a previous sonicare model for years without ever encountering this issue my wifes toothbrush is identical to mine and it has exactly the same problem so there is pretty obviously a serious design flaw with this modela cheap the sonic seal for e series sonicare replacement heads pack of blue pink frost available on amazon currently for pretty expensive for what is essentially a toothbrush condom so i tried making my own in three easy steps take a latex glove and cut off one of the fingers cut off a very tiny section at the end of the detached fingertip the resulting small hole will stretch temporarily in the next step slip the glove finger down over the brush head leaving the tip end above the top gasket of the brush head and pulling the rest of the latex down to where the brush head joins the handle voila no more slime build up keep the glove on hand in case you have to make more protectors later on