What was found
AFTER ROTATION CA AND FO STARTED TO SMELL SMOKE . VERY FAINT WHITE SMOKE SEEN BY PILOTS AND FAS WITH CHEMICAL ODOR. RAN CHECKING CARD AND QRH SMOKE AND FUMES REMOVAL PROCEDURE. TURNING PACKS AND RECIRC FAN OFF REDUCED ODOR SIGNIFICANTLY. FIRE RESCUE DID NOT NOTE ANY HEAT INDICATION. DETERMINED THE CAUSE TO BE WATER WASH OF ENGINES PERFORMED DURING NIGHT MAINTENANCE THE NIGHT BEFORE. COMPLIED WITH TS # 002736-R1 AND PERFORMED HIGH POWER BLEED SYSTEM DRY OUT PROCEDURE IAW CRJ 900 AMM 72-00-00. NO FURTHER ODOR DETECTED.