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if it's heavily incrusted, you can try a household multi-surface cleaner (in France we have one called Cif, don't know the equivalent in England). It is powerful and contain abrasives, so it'll dull the paint, but I had very good results on very old frames with it.
Afterwards, you'll want to compound and polish the frame, in order to restore it's shine.Another, less aggressive method, would be to use a clay bar. Car enthousiasts use that to remove ingrained dust and tar, seems to work very well. I haven't tried it though.
Pish
@neil-bah
The dirt has kind of become ingrained in the colour coat..ive tried to buff it out with various cutting compounds with marginal improvement. Any ideas? im tempted to wet n dry sand like you woould fresh paint before laquer and then re apply the clear. Bad idea? Might be a case of repro all decals and get new reynolds ones and sending frame off to be blasted then powdercoated or painted. It would save a lot of manual labor but maybe its best left ratty and i just clean up the rear ends/anti rust treatment/prime and paint in the nearest yellow i can obtain.