The Dawn Power Dissolver I got at my local Wal-Mart is of the gel type in a bottle, not the spray on as you described. It does say for pots and pans as prescribed.

I put it on with a towel, spread liberally, let set for 30 minutes and then scrubbed with a tooth brush. Took off some of the stains but not the crusted on type. Plan on getting a soft wire brush that may be more aggressive in taking off the stains. I can take a exacto knife and scrape off the stains, so I think they are loosening up some. Don't want to leave any scratches on the engine casing.

Will try a second coat tomorrow



OK I seen what I done. I got Dawn Power Clean, not Dawn Power Dissolver