Staining a piece of wood can be tedious when you want a flawless finish, and nothing ruins the work more than dust or debris landing on the wet surface. With such potential for this to occur, knowing how to remedy this situation is important and can save your hard work from being destroyed.
Let Stain Dry
If the stained surface is still slightly wet, it's a good idea to let the stain finish drying before trying to remove dust or debris. Attempting removal while the stain is wet will likely ruin the stained area and require having to start over with your project.
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If the amount of stain on the wood wasn't heavy, you may be able to wipe off some of the dust with a damp rag or tack cloth, once the surface has dried completely. If the stain was put on heavily, some of the dust may come off with the cloth, but a lot may still remain. Wipe with the grain of the stain and try not to rub the surface too much. Simply run the cloth gently over the surface.
Sand the Surface
If the amount of dust left on the wood is still highly visible, you'll want to take some fine-grit sandpaper (about 360- to 600-grit) and gently swipe it along the surface, moving with the grain. Sandpaper at this grit should be fine enough that it won't remove noticeable amounts of stain.
Stain the Surface
If it was necessary to sand the wood to remove the dust, you will want to add another thin coat of stain to repair any imperfections created from sanding. Ensure the surface is clean before you start, then apply the stain in the same direction as the first coat.
Most projects will require a coat of varnish to protect newly stained surfaces. Remove dust to an acceptable level before applying the varnish, which will seal the surface and trap in any foreign particles.