Got a big riding mower with the engine in a crowded, tight compartment.
The engine has gotten very oily and greasy due to some oil blowing out the
breather. Problem is now fixed.

How do I clean the engine? My first inclination is simply to spritz it
down good with strong liquid detergent, let it soak awhile, and then flush
off with water.

That should get it cleaned up, but am I going to ruin anything by doing
this?