Engine flush... Yes or No???

They used to sell "engine flush" in 1 gal cans at auto parts thru 1980's. I used it once in my 1969 Dart 225 (Rislone, I recall). It was hydrocarbon solvents, similar to kerosene. You idled the engine with it in the crankcase for a few minutes, then drained. Maybe 1 year later, the oil lamp came on, then went off. Came on again a few months later. I had the engine rebuilt since other issues. I suspect the flush dislodged gunk which blocked the pickup screen. I would never use it again. If you think the pan is gunked and won't remove it, if you have time drain and pour in diesel fuel and let it sit for a few weeks then drain. Bio-diesel or vegetable oil works even better. You might use diesel-rated oil (CJ) in the future since it has more detergents.