I have been using the blue-thru kit for many purposes. It’s a great product to wash your boat, rods, and reels down with, it does a super job. I also washed windows with it and just squeegee it off. Of course, I can not see the salt deposit and calcification inside my out board motor, but is removes the salt from my reels; therefore, it is removing the salt and other deposits from inside of my engine. Great product, love it!!!