Thanks bro, i dont go to service station from long time, i clean engine bay 2 or 3 times a year. I dont wash it. I remove the dust first, apply wet cloth, use tooth brush, spray bottle (usually find in the barber shop) filled with soapy water and then clean it with dry cloth. and apply luster and wipe with dry cloth. takes around 20 to 30 minutes for detailing. service station guys never spend much time or do a fatigue for detailing. All they know to apply pressure water, samney samney kapra mara and apply diesel to give shinny n clean look. A cloth n luster engine oil jab change karwata tou wo banda de deta sath.