I received a call from a lady that has concrete splatter on her paint and bumper and wants it removed. I did a search and found a previous thread but those items looked like they would have to be special ordered. Is there an OTC product that I can buy that will work that is safe? I just didn't want to wait for an order if there is something I could buy OTC. Sorry no pictures I haven't even seen the vehicle yet myself just going off conversation.