Salam o Alikum
Good work on a clean engine bay sir. I will recommend ASTONISH ENGINE DEGREASER - costs about 250-300 rps depending on where you get it from.
All you have to do is spray it on (after covering sensitive electrical components) leave it for 5-7 minutes and rinse off using water hose (no need for pressure washer) let dry naturally.
It is a good product, used it myself.
Available in metro/ hyperstar/ d Watson etc etc