Advrsams

Hi All, Apologies for the question which may have already been asked. My octavia has the EGR valve at the front of the engine I beleive (correct me if I'm wrong). 2007 2.0 vrs diesel. I know very little about cars and want to clean out mine as I think it may be clogged. I took the hose off the bottom this morning to look inside and it appears to be clogged up. I have tried to remove the unit but one bolt is tightly behind another metal pipe with disappears somewhere into the engine bay to which I have no idea where. I have seen some pics and chats about rear egr removal amd wondered if anyone could kindly give me some advice. Thanks in advance.