I just cleaned my egr. It seems to be working a ton better. From all the car mechanics in my area they say that these are parts that can be taken off and cleaned once a year to revive them. I was instructed to use a break cleaner or something similar and a tooth brush. Although please keep this in mind!!!
When you take your egr off, the egr tube that goes to your exhaust manifold might not be in very good shape. I live in the mid-west, my 94 has less then 100k miles and the damn pipe damn near fell apart on me when i took the egr off. This is a part that i could only find at the dealership or the salvage yard. I paid 106$ for the egr tube, eek. and i didnt fix my real problem. So cleaning the egr might be a fun experience. Good luck.