How to remove cement off of car

[89rs-red]

Hi im new to the forum and have a problem with my car. It is an 89 camaro RS and it has some baked on cement looking thing. im looking to see if any one has some tips as to how is should go about removing this. Any advice will be appreciated Thank you here are some pics last one is just one of my random pic of my car

[02xtreme07SS]

I've only heard of this product being used, but had not used it myself. It's called Backset and it is designed to break down Portland Cement.

Back Set by RoMix Chemical & Brush 800-331-2243 (http://www.romixchem.com/romix_cart/back_set.php)

[thebamboo23]

Sub'd