Thanks for your thoughts so far everyone. I thought it was maybe to do with chopping boards, but last night I left my iPad propped up in its case on the worktop, and found trails on it this morning. Aaaargh! I shall clear the worktop tonight and maybe sprinkle some salt over it. We had a big fly in the room last night and despite using fly spray at the other end of the room it was still flying about. Could it be a fly leaving a deposit after crawling over things? No sign of trails on the worktop.
What’s a household item that reminds you of your grandma’s house?
