OK, tried it out with the cleaner you recommended on a five year old Subaru engine that's never been cleaned. I made sure to cover the alternator and the main wire harness connection. Blew out the leaves and loose dirt with a leaf blower, sprayed it down with cleaner, waited 90 seconds, then washed it off, I spent an extra 8 minutes using a wheel brush and scrubbing the big areas, then blew it off with a leaf blower. Looks great, and the car started up and ran just fine. Neighbor decided to do the same thing on his BMW 340, it turned out great and started/ran just fine (BTW, we both took off the plastic engine covers, to better wash the whole engine). As you noted - DO NOT let the cleaner sit more than 60 seconds on your engine, or it will get sticky and not wash off easily. Thank you for the great video!