Did a search and found nothing so had a quick look on SOC and yep its a terrible job to undertake from what i gather so instead used some wax to wax the covers up then cleaned and wiped and a very good result very clean !!!Are you sure it requires cleaning on the inside?
If so, then you'll need to remove the metal clips, and maybe heat it up with a heat gun to soften the glue, and prise it apart. Some people even put them in the oven for a while...
Not a job for the faint hearted thats for sure.
I'm sure this has been covered before on here....maybe do a search.
I've been told 50 degrees is enough for the job.20 mins at 80 degree in oven warms the glue up just fine. did it on mine when i converted to LhD lights