There is no easy solution to cleaning an already-dirty EGR valve without disassembling it. This can be a challenge for any but the professional technician. Generally speaking, a dirty EGR valve is an indicator of a dirty intake manifold or throttle body housing. Once the EGR valve and passageways are clean professionally cleaned, you can keep them that way by using Berryman Total Fuel System Clean-Up (#2616). This product will eliminate the carbon deposits throughout the fuel system and help prevent build-up.