I really appreciate the pointers and the help I’m getting at the moment, really really appreciated thanks again guys!
I think I have just discovered that performance of sketchup has been affected a tad over the last day not to the point of unuseable but a slight noticeable judder in frame rate? This has forced me to tidy things up… group things, put things the right layer etc… turn off guides etc, that usually helps.
I have to add that at the beginning, I was getting frustrated and hung up with the clean up tool as that was stopping me from creating. I was wondering why my windows were causing errors. I was obsessed with using the cleanup tool after every single thing that I made, as I wanted to make the red numbers disappear I was obsessed with hunting down all these errors and correcting them. My geometry just became as you say bloated. Instead of becoming simpler, I somehow assumed that sketchup wanted me to create proper windows, frames etc… as that made the cleanup tool happy