Your EGR valve uses 2 bolts to hold it on. They are metric and 10mm. Forget cleaning it. It is not that expensive, just replace it, and use a generic. The factory valve is 3 or 4 times the cost.
Your EGR valve is connected to the Exhaust manifold and an EGR LINE which leads back into the Intake Manifold. There is also a small line connecting it to the sensor. Usually green in color.
Do yourself a favor, remove the EGR line first, from the intake manifold. Then remove the EGR valve. And carefully wiggle the two connected parts out of the engine compartment. Once clear, loosen the connecting bolt and seperate the LINE from the EGR valve itself.
Clear the ports and scrape off the old gasket. Vacuum the area whether or not you saw anything drop in. Reconnect the EGR line to the new EGR and install the EGR valve then tighten the LINE to the intake manifold.
Hopefully you have small hands. If not, ask a friend to help, who is small. And flexible. And only wants a couple of beers for compensation.