I see an ad campaign in the making:
"Cheapskate Siding did this work:
But, not to worry; We at XYZ made it all good!"
Might be interesting to see how much Cheapskate will pay for you to take the ads down. Heck, they might even hire a real pro to clean up their jobs, on a regular basis.
NOW THERE'S AN IDEA. Visit Cheapskate first, and pitch your services to them. Maybe even see proofs of the ad copy. Heck, they may see the error of their ways.
"I see the beginning of a beautiful friendship."