remove all the grommets carefully so you dont have to replace them, unbolt, and pry off cover. Turn cover over, remove baffles/screws ect- clean with solvent-- I use tolulene in a squirt can/carb cleaner-Throttlebody spray. Spray on, use a toothbrush, ect-scrub that puppy clean. tolulene can remove paint, but if it dosent do a good enough job, just throw more paint on the black. In an absolute pinch, laquer thinner cleans all evil demons.
When your done, regasket! use RTV sealent(senser/sensor safe) or buy an expensive gasket from mopar/parts dealer....reinstall.