well be careful in using petrole+detergent,but i always preffer engine cleaner,this will not solve the problem at once,you will have to be consistant in cleaning the engine though i am not satisfied with my own car's engine cleanleness but i never ever want my car to get short circuit on the way so i always avoid water.pressurised air can be used but will remove apparant dust only.
the oil in picture no 1 looks old,where as get ready for the internal right axil replacement because in the picture no two i can clearly see the grease is stuck with your car's body after being thursted by the inner axil's torn boot,see in the left lower corner of the second picture.i am quite sure.The boot is more important than axil,because once a boot is torn,samj lo the axil is no more if you dont quickly replace the boot.
The steering fluid leakage can be judged by the lequid level,if the level in reservoir falls very often then there is some big leak like seals in the power pump or may be supply line fault,but if the level is maintained or reduce unnoticable oil then there must be loose pipe clamps or the steering pump's T which is tightend inside the pump,there is a silver or copper washer inbetween,often this washer is much pressed,change the washer and there would be no leakage rather you say it seepage.