Yeah, they're really bad.  I guess they've been neglected for a long time.  I tried baking soda plus dish detergent, which helped a little.  Then I decided to go for the big game with ammonia inside a plastic gallon bag, tightly sealed and left for almost 24 hours.  It did somewhat better but still not enough.  What should I use next?
				
			 
	 
 
		 
 
		 
 
		 
 
		