My friend brought over his cabin sole and some assorted pieces of teak for me to refinish. The old varnish on the sole was literally falling off. I removed 90% with a broad knife. The rest required sanding. The wood was damp where the varnish was peeling away. I let it dry and hit it with the sander. The holly strips where the wood was damp is darkened (mildew?) and the darker teak is splotchy. I don't want to sand too deep. Is there anything I can use to even it out before applying new varnish?