Had a bit of a wee accident with some mastik style adhesive trying to stick me number plates on, dont ask why my dad suggested it

Removed all the glue that was in the wrong place, but where I had to use my thumb nail to scrape it off, there some hairline scratches. I wanted to use a little polish or t-cut to remove them, but do either methods leave one faded patch? I say this as there was a small patch on the bumper, and Im worried if it doesn't blend it will be obvious..
