I had my windows replaced earlier this week. The old windows had metal U brackets to guide the rolling shutters. The gap between them and the brick wall was closed using some kind of (grey) silicone.
Now with the new wooden windows in place (without those U brackets), I noticed there are still remnants of the old silicone on the brick and this bugs me a lot. I tried scraping it off (very carefully) using a knife. This works for the thick pieces, but it leaves behind a grey color on the brick.
Is there a way to remove the color left by the silicone on the brick completely?
The windows have an oil based coating. I don't want to risk damaging this coating (or the wood), so I hope this is somehow possible.