Never wash your bike with a high-pressure cleaner or a hose from a very close distance.  Please ensure you use only a low-pressure hose to clean sensitive parts like bearings, headset, wheel hubs, etc. Use a soft brush and a bucket of high-quality bike cleaner to wash off all stubborn dirt.  Rinse off your bike with a low-pressure hose to clean off all excess soap.  Wipe down your bike with a soft cloth to dry off all excess water.  Apply a high-quality bike lube to your chain.