You don't have to desolder the Uni to lube your switches! Follow the video guide on how to open switches without desoldering: Spring Swap Video
Above 20 grams
If your keyboard has springs heavier than 20 grams, like the 35 gram springs that come with the Uni by default, you can lube your springs with the standard lube like Krytox 205g0 or even SW-92SA.
20 grams and below
If you have 20 gram springs or lighter, it's recommended that you use lighter lube like the Krytox 105. This is because heavy lubes like to prevent the switches from coming back up properly.