We just bought a 10 yr old log home last year. We cleaned the back deck last summer, and noticed that some of the stain on the back log walls came off. The house needs to be restained. We like the color, which we think is Sherwin Williams Woodscapes (the can was in the basement). If we wash the logs with Log Wash and the stain comes off unevenly, will we need to blast it before we stain? Or will we be able to stain over the existing without it looking blotchy? Could we not wash it and ju