| Rear wheel staining
Can anyone help? When cleaning my 916 last month I noticed some staining on the rear wheel which resembled chain lube however it would not wash off, I have since tried white spirit, WD40, T-cut etc but it won't shift. Anyway I cleaned it again yesterday and there is more of it which has got me thinking that it is brake fluid though I can't see a leak and too be honest I am not a big back brake user. Does anyone have any idea what it could be? The bike is a 1995 Biposta with which I have owned as a second bike for years and has covered less than 10,000 miles. ANy help would be appreciated
cheers | 
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