You should reverse flush it immediately after using it and then soak it in Star San. After that, you can dry it out but you need to do it quickly, or place it into a long cylindrical container filled with Star San solution and put a lid on it - this is what I do. Next time you use it, drain it for 30 minutes and throw away the first litre of beer that runs through it. If it smells off, chuck it out but that shouldn't happen if you look after it