I recently used CorrosionX on an outboard marine engine that had been sitting for a while and was completely frozen up. We had tried another product with no success, but within 15 minutes after spraying CorrosionX into the spark plug holes, we were able to turn the motor a little. About 15 minutes later, after working it in, we were actually able to start the motor! The following day were able to go for a ride. Your product is truly incredible. I just sent in an order so that I can try some of your other products. Thanks for a great product!