Corn cob blasting is a process that is similar to sand blasting, but the media that is used isground corn cobs. It looks like corn meal, but more course. If the interior logs have already been stained they just need to be hand washed with warm water and TSP. You may want to apply a clear coat to help seal them for cleaning purposes after washing. Perma Chink makes an Acrylic Satin or Gloss for interior use. The exterior once stained properly should have a maintenance coat of what ever the manufacturer recommends every 2-4 years. Inspection of the exterior twice a year looking for problems will help maintain the beauty of the home. Look for peeling, fading, caulk/chink splits or water splashing problems and address them immediately. You can obtain all of the products that you will need to maintain your log home from Timeless Wood Care Products at 800-564-2987.