Polish on the plastic :(

[inwardnoise]

Dont use sunflower oil over time this actually fades black plastics and breaks down rubber seals etc

Linseed oil / flax seed oil is your best bet but don't use to much as it leaves a 'deep' grease mark but this should solve the polish issue megs also do a remover if you wana spend a little more ££££

 

[Giles]

Use TFR or GT85 safe to use.

rubber are not a good idea cos it will make the plastic smooth & shiny.

 

[alan]

AutoGlym Fast Glass usually shifts it.