Had the oil and filter changed on my 2009 Mazda 6 two weeks ago. The day after oil change, drove on highway (about 40 miles) before coming to a stop and noticed smoke coming from under hood and through AC vents. Discovered oil cap was missing and oil had spilled all under the hood (almost 3/4 qt.). I cleaned up with a rag what I could but the smell of oil is still very strong and unpleasant. How aggressive of a clean-up is safe to do? Pressure washer? De-greaser?