Try hand cleaner. I read about it somewhere and used it to clean an M1. It worked great. Look for a typw with no pumice and some hydroxides in the ingredients. They break the oils down into something water soluable.
With hand cleaner you could even clean it in the sink.

I use odorless mineral spirits.  The napatha would smell more.

Use the regular precautions such as WELL ventilated area and wear gloves.  NO Flames nearby.<G>

Dennis Jenkins

Quoted: I have some Naphtha that was required as part of my Alexander Arms 50 Beowulf MuzzleBrake install and was wondering if I could use it on my incoming Select Grade Yugo 59/66 SKS. is it safe enough to use on the wood and metal parts

I picked up a under the bed plastic storage container at the local Home Depot , (about $7.00). It's a good three feet long , eighteen inches wide and a good six inches deep with a cover. I put a couple gallons of kerosene (about $4.00), disassembled my Yugo sks's that were totally covered in cosmoline. With a brush and a rag I got every speck of goo off. Then I put the cover on the container and it sits in my garage awaiting its next cleaning. Much cheaper and easier than buying gun cleaning sprays.