What was found
VERY STRONG CHEMICAL BURNING LIKE SMELL INTERMITTENT IN FLIGHT DECK AND CABIN. NO VISIBLE SMOKE OR OTHER ABNORMAL INDICATIONS. STRONGEST DURING T/O AND 2 TIMES IN CRUISE FLT / T/S PER FIM 21-21-00-810-806-A01/ FIM 21-22-00-810-806-A01, PERFORMED CLEANING OF BOTH ENGINES FOR PERFORMANCE RECOVERY IAW AMM 72-00-00-100-801-A01 SECTION 4 G FROM ITEM 4 THOUGH 19 . NO FUMES OR /AND SMELL ARE NO LONGER PRESENT.