Kano Aero Penetrating Oil, 10 oz. aerosol (AERO)

I've tried a lot of stuff in the past, but this is the best for extremely rusted nuts and bolts. This is the only stuff I'll buy from now on.

I had a particularly difficult union to remove with severe corrosion on it. Tried well known penetrants but they did not work, so cleaned them off with a solvent cleaner and applies AeroKroil. After three days of reapplying it, the union was able to be removed. Brilliant product!

Expensive but works second to none, you definitely get what you pay for.

Used my 'normal' penetrating oil on a seized bottom bracket on an old Halfords steel bike. Put the bottom bracket in a vice and turned the frame, absolutely no joy. Bought some of this, a squirt a day over 4 days, then the same vice technique and it came loose first time. Expensive but worth it for an amazing penetrating oil.

Great product. Does what it says.