[HawgRyder]

I guess over the years I have become very paranoid.
When building an engine NO ONE is allowed to come within 20 feet of the beast.
If I leave the build area for more than a few seconds, I cover the engine or whatever part of it I am working on at the time with clean plastic sheeting.
For overnight sitting...the same plastic...taped...and checked for holes.
I had a lookie-loo bend over my engine one time...with a cigarette in his mouth...you know the rest...ash fell into the valve galley....he tries to brush it out...spreads it all over the place....disaster!!
I threw a 1" box-open at him...missed by a hair...he has never been allowed in my garage since.
I tore everything down...washed...and rebuilt.
BTW...cigarette ash is metalic.
A little paranoia is a good thing.
Bob