Hey Greg, if it's truly scarred,..as in,..physical damage,..I can't imagine there's much that can be done to fix it by further cleaning? May look better though removing all the grime and evening it out.
*Sometimes it sucks doing work after someone else caused damage. Then anyone seeing you work there thinks you did it,..that's how many people put two and two together.
**I did a gym once and it had blue cloth awnings, their handyman used a zero nozzle and left "Zoro" marks all over them,..didn't get them clean at all. I cleaned them and even tried to work the marks out,..but they were too pronounced and didn't want to risk further damage by digging into the material that way. So now, on a drive by,..they are noticeable,..and I was there last. Hate that,..and it's also something I see alot on my travels. We did it before they opened, BUT,..there is a very busy convenience store right across the street,...and many people know me and my business,..and seen us there,...It's actually coming together as of late though,..but still.....
***Like painters who follow behind the homeowner who was really sloppy and got paint all over everything,..especially if they painted trim work around brick,..or the driveway sealing guy who follows behind the last guy who got it all over the siding and concrete,...
Just the way it is though.
Jeff