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#32821
trusty220
Keymaster

I use the Brick and Patio Cleaner that Jewsons sell. It’s quite a dilute Sulphuric Acid and so it is kinder on the metal than some others. Either way it seems to work well enough but you need to do the soaking in a well-ventilated place because it will give off Hydrogen Sulphide (H2S) which can be harmful (and flammable) if allowed to build up. The missus can be a problem as well because she objects to the smell!

I’m going to try Caustic Soda on the aluminium to see if that is going to shift the grime; I’m going to have to experiment with test pieces first before I risk the crankcase.