Saxo Tail lights

[natty94]

Hello,
I've had my Saxo since the summer and since the beginning of the autumn and the rear right tail light has been misting up now the weather is getting colder, today I decided to take a look see what the cause was and ended up pouring a considerable amount of water out of the light cluster.

Have any other Saxo owners had this problem with their tail lights misting up and is their a DIY solution to this problem?

Thanks in advance
Nathan