What to use to clean the inside of my engine?

I recently brought a Honda cb550. Prior to buying it I was told there was a head gasket oil leak. Since I have to strip the engine to change the gasket I thought I might as well give it a good clean. As I know the engine hasn t had the oil changed in a long time I know it needs a good old clean inside anyway. So I wanted to know what spray/fluid would I use inside to clean all the components and and walls of the engine? Is there anything I shouldn t use and is there something that works for cleaning all the components and engine parts? Thanks!

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