98 Accord V6 intake port question

Greetings to all, I have a 98 Accord EX V6. Had the intake ports cleaned and bored out per the TSB at ~45,000 miles, no charge. Well...at 88,500 the check engine light
went on again, and the code was related to the intake ports (again) and the EGR. I spoke to the tech himself who seemed very knowledgeable, said this happens commonly at ~90k miles. Ports cleaned and EGR replaced to the tune of $265. My question to the forum is: do any of those after market "valve cleaners" etc reduce the frequency of this port clogging that is inherent in the Accord V6 engines. If so, then what products are good?/ Thanks!! Matthew
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.