How can we clean brushes and tools that were used to apply DuroGrit?

Clean them with water, immediately after use.

After multiple uses, the bristles of the brushes may start to feel a bit “oily” or sitff. In that case, you can clean the brushes also with warm (not hot!) water and mild soap or dish detergent. Another option is to use a bit of Exterior Wood Cleaner and water. The product will come off much faster than with just plain water. Repeat the soaking and swishing process until the water runs clear. Rinse well with clean water.