These are simply finished natural wood grips.   Unlike polyurethane coatings that can chip or peel, we use traditional wood finishes like oil and wax.  Our hardwood grips can be lightly sanded if adjustments are needed and refinished with Danish Oil or Linseed Oil if necessary.  Laminate and hardwood grips can be maintained with any wood polish or furniture wax.  They will not be harmed by cleaning solvents but should be wiped down each time you clean you firearm.