Bob Mills Furniture Amarillo: Steps to Remove the Dirt Build Up:

Start by selecting a work area that is very well ventilated. Working outdoors is best as this solution produces a strong smell that you don’t want lingering in your home.
Prepare the work area by covering the ground with a protective covering such as a drop cloth, large sheets of cardboard, etc. Gather rubber gloves and a mask for yourself.
Bring the wooden piece outdoors and begin by wiping it down with the paper towels to remove as much of the grime as possible. After you have wiped it off, use the vacuum with the brush attachment to gently brush dirt from the crevices and corners.
Next, mix together equal parts of the linseed oil, turpentine and white vinegar.
Moisten the soft cloths lightly with the solution and gently wipe the dirt and grime off of the wood surface. As you are cleaning, wipe the liquid with the grain of the wood and take caution not to soak the wood.
Continue cleaning with the cloths just until the dirt is gone, do not scrub too much or it may damage the finish.
For corners, designs, etc., dip the old toothbrush into the solution and gently work it into the grooves. Follow the grain as much as possible just as before. Wipe away with a clean cloth.
When no more dirt is showing on the cloths, discontinue any further applications. There is no need to rinse the wood.
Allow the piece to dry completely.
When the piece is completely dry, buff with a clean cloth to restore the shine.
Dispose of any remaining cleaner as well as any cloths with cleaner on them using appropriate methods. They can automatically com bust and start a fire, so be sure to dispose of them promptly and properly.