I'm having the same trouble with an MFI black laminate worktop.
It has lost its sheen a bit.
As said earlier, MFI have gone out of business so I'm not sure what use a small claims court would be.
There is a product called Countertop Magic and I reckon it would do a good job. Can't get my...
Just thought I would post this as a tip for anyone who has this problem with a laminated plastic worktop that is flush joined with no metal strip between.
Typically what happens is that when the worktop is joined at a corner, no sealant is used, or perhaps the wrong sealant or not enough...