I have tounge/groove barn siding in my living room that was varnished years ago and is now turning orange and dark My question is how do I clean it to lighten it up? I used a stripper in one spot and it took it right down to the bare wood-should I use varnish again or can I use polyurethane to protect the pine wood? Is there a special cleaner to use in stead of the stripper that will lighten it up? If anyone has any answers please let me know! I want to get rid of my orange walls!!! Thanks