I'm sure that a lot of you have used this but Carla and I just tried it for the first time yesterday...totally amazing! Our front brake calipers had all of the bolts seized with rust including the hoses. The only bolts we could get out were the ones (luckily) that held them on the car. Bleed screws, etc. were frozen. After 5 hours in the solution, they all came right out and the calipers are clean.