White spirit or turps wont shift a water based paint. As Nige F has stated maybe touch in with black gloss. I usually paint older faded plastic rainwater pipes/gutters etc with one coat of thinned oil based gloss and it dries like a mirror. It wont come off either.
Methylated spirits did the job for us. Just wash the pipe down thoroughly once you have got the paint off, or it can cause discoloring. Where this happened, I then had to cream cleaner the plastic to get it back to white
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