Which OTC Shampoo would be more harsh on my LSP MEGS Gold class or NXT. I;ve been using NXT here lately in my foam gun, and in the solution bucket because I havent had the money or the luxury to order anything nice yet. I KNOW that this is very hard on my LSP. Just trying to explore my options. Is there anything else that I might want to try OTC that I could safely use in my foam-gun.