After searching for the perfect, no spill coffee mug, I thought I found it in the OXO Liquiseal mug. It has a very good design for not leaking or spilling; however, I have found the lid to be very hard to clean. You cannot disassemble it the lid, and after a while, there is a build up of "gunk" inside the lid.

Has anyone found a way to thoroughly clean the lid since the manufacturer does not recommend dish washer use?

Here is a link that might be useful: OXO Liquiseal mug