Use washing up liquid and warm water,then apply teak oil
If you mean it's white when it's dirty, I would say it's a blackboard. If you mean it like you wrote it though, I would say it's a zebra.
poisonous puss
The question is quite broad. As a home owner; you can clean the glass, the exterior and ensure no dust is around the the air inlets. A vacuum works quite well. Do not play with or remove the gas...
Asbestos sheet, ceramic or marble may be used as insulators.
Use WD40 first and then wash trailer with a mild soap - WORKS GREAT!