I just refinished a log sided cabin last summer that had 65 years worth of paint and various finishes. Here are the steps that we went through
1- Jasco - Spread it on and then scrape it off. Now this is very important - Be sure to use carbide tipped scrapers. U-shaped paint scrapers will not do the job. Buy some smaller blades to get down into the joints between the logs.
2- Wood bleach. Use a wood bleach with oxilic acid to remove any staining.
3 - Power wash - Rent a power washer with at least 2500lb psi. Be sure not to keep the spray in one place too long. Also remove any window coverings, pictures and furniture from on or near walls. You may actually blow water into the living space. This is especially true when you do the eaves and sofits.
4 - Rough sand - Use 50grit sand paper in a palm sander to knock down the raised grain and fuzzy wood fibers. It doesn't have to be perfect, remember it is a log cabin so a more rough or rustic look is usually good.
5 - Seal it. Let it dry and seal it with some type of wood preservative. Follow the products instructions for the best results. We used Superdeck on ours and it turned our great.
I know that this sounds like a lot of work but the results are well worth it. Our log cabin looks fantastic.
Dick White Tahoma Meadows B&B email@example.com