The only grease I have used is Park Tools and after putting it out there that I have suffered from this problem, I have received lots of advice from those better informed that me pointing me in the direction of alternative products.
The squeaking of the suspension block is something I have had on all Brompton bikes I have owned. I have always had the firm version and despite greasing, after a few days it seems to come back. I really don't know what I am doing wrong?
Have you suffered this problem? Was it something other than the suspension block needing some grease? Is there a knack to applying grease in certain areas? Any advice would be appreciated so if you are one of those people in the know, please consider leaving a comment.