 Hello there. I'm a 78-year-old contractor who today is sending up aluminum to put on the windows Monday. Love what I do. And I have two quick questions for you. Once you do it, you can't get it out of your blood. Yep, I hear you. First question is, a lot of times I run into drains, especially for rehabbing places, and I want to put something in them. Is there any reason I can't use RV antifreeze?