Cleaning an old Nelson bubble light?  

Look at this thread
Click the link below.
http://www.designaddict.com/design_addict/forums/index.cfm/fuseaction/th...

Of the advise Pratick...
refered to the one from Yoki make sense" "TSP otherwise known as trisodium phosphate (purchased at any hardware store) disolved in slightly warm water. Follow the box instructions and this will clean any old grease and dirt off without rubbing or scrubbing which increases the risk of cracking or damaging the shade. Make sure the water is only slightly warm otherwise the rubber like material will become baggy. This will clean it. However, the lamp can and will discolor over time to a parchment-like U.S. constitutionesque color. This is due to the use of antioxidants in the rubber. Antioxidants are used in old rubber formulations to keep them from prematurely aging and to prevent the rubber from getting brittle. Over time antioxidants react with oxygen, heat and light . I have been so far unable to reverse this chemical reaction so the lamps come out looking new but colored in various shades of...parchment"
Of course stains caused by rusting of the frame will not come out that way. BTW the shade is not in rubber or any rubberlike substance but taht does not matter the softeners that are used evaporate over time and discolor with the known result. I do not have one to try it but based on my knowledge of plastics a 24 hrs in a 10% chlore solution will do the same job. The problem again is the steel frame, so stick with the TSP

Thank you for the responses.
The information is very helpful.
Below is the link to the lamp in question. I think the price is too high for the condition it's in. A new one is only $100 more and I would know just what I'm getting. I don't need it for another year anyway so I can afford to wait.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=270013387543