I’ve a more sensible theory, now. It’s based on “coincidence”.
A closer look at the marks shows they aren’t, as I at first thought, a sort of collection of rectangular paterns. The Sherlock type magifying glass shows they are almost parallel lines in one direction, with other similar lines, almost at 90 degrees. From this is derived the large number of four sided scratched figures. That’s the sort of patern that might come from the two directional way in which I often apply polish.
Now to the coincidence. Until a few years ago we owned a steel trad type canal narrow boat. On one vistit to the marina the vertical side panels, on one side, had similar scratch marks. Eventually I managed to almost remove them, using green T Cut. At the time I thought it might be either vandalism or, more likely, grit on the sponge used for washing down the sides, before applying pre winter polish.
We eventually sold the boat. BUT, I brought the Turtle Wax bottle back home. I’m wondering whether I might just have picked up the same bottle of polish, when I recently polished just the bonnet of the car. Since I’ve often washed the car, using the same cloths, followed by wiping with micro cloth, it doesn’t seem likely that the cloth is the culprit. One of the two bottles of Turtle Wax just might be.
I’m looking for a suitable piece of painted metal, to try each bottle of polish on, to see if one contains something abrasive.
Meanwhile, I’m open to ideas on the best way of trying to deal with the scratches. It looks as though they are confined to the laquer, so is it a job for TCut and the orbital polisher, or is there something better?
If all else fails, I’ll see if the local body shop can tackle just the bonnet. That should be a bit less financially ruinous than a full respray!