Amazing - it worked great on my RV
I used it to remove cement from the front of my fifth-wheel trailer.  I had not realized that the splatters on my trailer were from wet cement.  I had tried scraping, vinegar, WD-40, alcohol, Simple-Green, etc. and nothing would take it off.  Then, 6-months later it dawned on me that the splatters might be cement.  So, I tried Speedy Clean Concrete Dissolver.  It took several applications, but the cement softened so that the majority could be wiped of and the rest could be scraped off with a plastic scraper.  It did not damage the surface of the RV nor the vinyl trim that runs around the perimeter of the front.  I highly recommend it for cement removal.
Rating: 5 stars