I am gonna drill them out but as i see that rust has come to visit my engine
is there anything to flush it all out? i haven't run the engine for 4 years and i'm afraid that it may not be in good shape..

I've heard that putting them in antifreeze overnight gets rid of all the dirt .. but i don't know exactly how to do that
Do you put the internals and the antifreeze unsolved in a bowl and leave them for 8 hours let's say?
Afterwards do you clean them with 3M brake cleaner?