I'm having trouble finding a source for pure ammonia. Yes I know there are other methods (shrimp and all) but I went as far as to talk with the manufacturer of several brands of ammonia including Mr. Clean and Parson's and Albertson's Simply Clean. They said its not likely that truely pure ammonia is made anymore. They did mention that their unscented clear versions of ammonia have less that 1% of any surfacant or perfume combined but do indeed have them. Is this good enough or do I need to just try another method?