I’ve had four of these now. Both brands start off brilliant and the minute they get damp (impossible to avoid for me) they turn to mush and whatever you do to clean them out and dry them they never work properly again. At £15 a pop they’re not exactly cheap. Short of the obvious ‘just use a pencil’ answers anyone suggest another brand that will work for more than 5 minutes. (I’ve actually had 5 and one of my dogs chewed one so I’m not counting that as a failure on their part.