We have had so much building work in our house since July 2014 and still have some more to do. All we had was Dyson's and no Henry, so the Dysons had to cope with a lot of rubbish like tons of plaster and whatnot. I have killed a DC05, DC24, DC14 Origin and a DC04 with 2 motors in 6 months throughout this period.
My DC14 Animal as lovely, had no problems with it really and happily sucked up the plaster dust and all that. The bin, however got really scratched. It looked so scratched that it was almost impossible to see the dirt unless you look at it closely from a certain angle.
I tried many things. A good wash and WD40 with lots of tissue, furniture polish, hand polish etc etc. The only thing that worked was a drill and a microfibre cloth. I had to apply lots of pressure and it took ages just to get a little part of the bin clear. I then thought "forget this Im just gonna put some spray on it."
As I has washed the bin with hot spapy water as well as the cyclone I was going to spray the bin with some polish which never worked but was alright, till I saw my bottle of Lynx hair spray in the corner of my eye. I thought "ooh, why not? it dries too and leave my hair shiny and is designed to be strong" so I sprayed it in the bin and got some tissue and hand polished it all round the inside and WOW. The bin was quite dry and not sticky. It was also clear! YES!!!
I then had another bright idea...
I have another hairspray, V05 type and tried it on my DC25 this time. The bins on those get very sandblasted. I sprayed, hand polished and it looks lovely!!!
Both my Dyson DC14 Animal and DC25 look like they have had bins which have been used like twice now :) It worked well for me and I am pleased with the results so I thought I would share this with someone who has a similar problem like I did.
Good luck :)