Hi, Just a quick thanks to all of you who posted a reply to my query on cleaning boiler tubes. I'm just off for a week, maybe I'll try out a few ideas on the petticoat pipes (which were 50% blocked!) when I get back or maybe I'll leave well alone! Thanks again. Barrie MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.