Puh! It was not easy to clean the GEOMETRY enamel panels I bought the other day. So far I have worked a lot on the orange ones.
I now have got some good advices if you will do this yourself one day…
First use steel wool with soap and water to get rid of the layers of dirt.
Rinse with water. For paint, you can carefully use a razorblade.
Then use hard carwax and finally paraffin oil to make them shiny.
I would love more of these panels if there are some out there.