Door and windows replaced in the front porch, just come down from the 'high' created by the adhesives used. Only joking but they do tend to linger. Hippo, your comments about cleaning the tea urn reminded me of an incident at work about 25-30 years ago. A colleague complained about the encrustation of tannin on the office teapot which was stainless steel, I mentioned that the best way to get rid of it was to place some washing soda and water in the teapot and leave it for a couple of days. This was what he did just before we all went home on Friday. Instead of getting washing soda however he got caustic soda, the type used for cleaning drains. On the Monday morning we opened the tea cupboard to find a brown foam oozing out of the teapot, it cleaned the teapot ok but it also removed the paint from the steel shelf the teapot was standing on.