Have two kegs left over from parties MANY YEARS AGO. If I wanted to keg, can I get these cleaned somewhere (they still have some old yucky beer in them)? And if so how do I do it? I'm sure you'll tell me to start from scratch and by a new keg. That's fine but what's the cost for a keg and the equipment needed to keg. I don't have anything to support a keg at this point. What are the basics that I'd need?