Sorry. Didn't know where to post this. But I suppose could count as a tip. Story as follows. I am having a bad morning. Everything's going wrong. I am really busy so before lunch I just put my two tunze cleaner blades into vinegar to get rid if coraline algea all over them. Made myself a sandwich for lunch. Sat down to watch telly. Sandwich glass of wine. Lovely right. ???? You would think so. Yeah.