Quote Originally Posted by ChadAmberg View Post
I know bleach gets the blood stains out... oh wait, that's not the problem you're having.
not really, it takes the color out but leaves the trace, there's other more expensive chemicals out that take care of it. but they're $100/gallon

Quote Originally Posted by james_bond_007 View Post
Might depend on the pressure washer.

I tried one of the "homeowner models" to strip paint off my gutters, outside clapboards, and concrete floor....nothing happened---it was worthless.

My neighbor loaned me his gasoline powered model.

Took the paint off my clapboards and stripped the paint off the galvanized gutters (down to the metal), with just water.
I had to be careful, as at first, with the "jet" nozzle. It put a hole through my fascia board, just below the gutter, until I learned how to use it better.
This was from about an 8' distance.

It took EVERYTHING off my garage floor with just water using the "fan" nozzle. It was literally like using a paint scraper to lift off the oil, grease, paint, etc.

While I can't guarantee it will work on your problem, I can say that my success depended on what kind of pressure washer I used.
This, I maintain properties for a living. I've never had to use more than a chemical related to the stain and a gas pressure washer.