When I received my Prelude (ebony finish), some part of the neck was stuck to the case. I thought the finish was melt by heat during the transport. When I pulled the soft case, some threads from the cover were left stuck to the neck.
I was thinking to use some benzene or oil to remove the thread, but I didn’t want to take a risk of further damage. Finally, I use coconut oil used for hair treatment to clean the threads from my harp. It’s the only safest material I could thought at the moment. It also has nice sweet fragrance that is different from coconut oil used for cooking.
I removed the threads patiently with brush, picking it up one by one. Finally all the threads were removed. It does leave some scar/marks like thread pattern, but wasn’t noticeable.
I’ll try to post some picture later..
I don’t know whether such oil available in your country, maybe there will be