Varnish and shellac removal depends on what the lac was mixed with to make the finished product. 
 
In old "classic" finishes methylated spirits will mostly remove the stuff. Metho & 0000 steel wool, then a hand rub with baby oil. 
 
Newer finishes might need acetone, but the old stuff just wipes off with metho.
		 
		
		
		
		
		
		
		
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