Hi, to be honest I've never tried cleaning the EGR valve. I've seen the wynns EGR cleaner spray where you spray into the induction pipe after the air filter. But not sure how effective it is.
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EGR cleaner spray is of limited use and so is cleaning just the EGR valve (neither is terraclean or any kind of fuel additive or "super duper" fuel because it goes into the fuel system/ injectors so cannot clean the inlet/ manifold)- the entire EGR valve and inlet manifold really has to come off and be cleaned properly because the inside of these things gets covered in carbon deposits/ gunge (the oil from the breather mixes with the carbon from the EGR forming an oily "gunge" that eventually chokes the inlet) from an un-blocked EGR valve (one that has not been deleted or has a solid EGR blanking plate fitted)