Re: Complimentary PML engine bay wash?
The engine bay is a quick 5 minutes job that most of you can do in case it gets dirty from time to time.
Cover up vital aftermarket parts like pod filters, exposed wirings etc. If engine bay is completely stock standard, there is no need to cover anything. Those of you who clean your MAF from time to time, make sure the bolts are securely tighten or if not you can use a plastic bag and tie a rubber band around it for added precaution.
PS* E9X M3 owners may want to put a plastic bag over their upper air intake vent. However if not covered, it is ok because there is drainage at the bottom before it enters the airbox. So as long you are not using high pressure.
Buy some engine degreaser, either aerosol (aweful odor, flammable) or citrus type and spray over Cold engine.
Wait for 2-3 minutes. Brush engine bay if extremely dirty. If engine bay is not that dirty, brushing is not needed.
Rinse engine with low pressure water. Dirt should come right off.
Start engine and let it idle for about 2-3 minutes to let engine bay warm up. Dry engine bay by wiping.
Please do not do the above when the engine bay is hot otherwise you will crack the exhaust manifold.
Hope this helps.