Answer: Most common thing I hear. Problem is nobody can actually tell me about this. Here is what I hear "somebody, someplace, sometime ago, somewhere, had something dipped, and they had something coming out of the seams forever" Well I can't even begin to guess what "someone, someplace, sometime ago" might have done or not done. Our process has been around over 40 years. It's specifically designed to remove paint & rust giving you a product that is 100% clean and ready for bodywork and paint. We take our job very serious and do our very best to make sure very part is 100% fully cleaned and ready for the next step. I can't say what any other person or company may have done in the past. What I can say is we have a process and flow that is designed chemically to treat your parts and leave them ready for the painting process. We are enthusiasts just like you and know what you want and need out of our cleaning process. We will challenge anyone to find a better and more cost effective method of removing paint and rust from classic car and truck parts.