@nick & @aactech - I rinsed it under the cold tap for around 5 or so minutes, making sure the water got in everywhere. I pat dried the outside and made a shallow bath of isopropyl alcohol and put the uppercase in there. Gave it a good swish around and let it soak for a couple of minutes, took it out, pat dried it, let it sit for 5 minutes and then made a second bath of alochol for it to go in, to displace any remaining water.
It’s currently drying out so I think on Tuesday or maybe Wednesday night, I’ll put it back together and let you know if it worked!