Go to www.woodspecialist.com for information on log home restoration on the west coast.
I prefer to sand entire house over cob blast. It makes for a better prepped surface and the final product looks better. Cob blasters are good for hard to reach areas like corners. I would rather use glass media than cob.
You could also use Osborne Buffing Brushes that are used with a right angle grinder.
Osborn Brushes are great for after blasting buffing. It would be very labor intense and expensive to do the finish removal, as these brushes are $75 a brush, and one brush won't go very far when you are using them for finish removal. They are simply just an expensive buffer. They are the best product we have found for buffing logs.
Bill, rotting organic material? Is that what mulch is made of? We are talking a trace, or a dusting of organic dust left on your lawn or landscape, after clean-up. What rodents are we attracting? If you are talking carpenter ants and borates, any reputable restoration company will do a borate treatment after finish removal.
If the concern is rodents, crushed recycled glass could be used instead for media blasting. Just as big of a concern with raised grain from blasting is compressed grain from sanding to remove a finish.