Answer: sandblast

AnswerCrossword Clue
SANDBLASTClean, with force
SANDBLASTRemove graffiti from, in a way
SANDBLASTEtch, in a way
SANDBLASTClean with high-velocity particles
SANDBLASTClean with a pressurized spray
sandblastRoughen or clean (a surface) with a jet of sand driven by compressed air or steam
sandblasta sand-laden wind / to clean with a sand-laden blast of air