For information on wood protection and durability please review Forintek/CWC website www.durable-wood.com
Forintek also recently completed a publication on protecting and finishing log buildings. Lot of your questions regarding protection and cleaning of wood are addressed there. The document can be viewed at http://www.forintek.ca/public/pdf/fact%20sheets/LogHome15sept03.pdf

Regards

Dalibor