He will be talking about the little gauze filter in them, it's a real pain to get to but if you run clean water through the lance after foaming it should be fine. I changed mine after about 7 or 8 years and even then it was only slightly blocked.
I'm not too good at posting eBay links, item number 231404993231 and it was 24.95 posted. Normally post is second class but as I was ordering a few days before Chritmas they agreed to send first class for no extra cost which was very good of them. Great item and honestly no difference in performance to the dearer lance I had.
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