OK, no real improvement after a good scrub with washing up liquid. Hippo, I'm wondering if mine have gone beyond that? They were certainly sticky (which was how this all started off) but there's no rubbery coating on them. They're just hard (and fairly brittle, I suspect) plastic. I think Mackers' bumper black is probably the next thing I'll try.
Mackers, when you say clear nail varnish, do you mean on top of the bumper black to seal them, or just straight on to the (cleaned) milky surface?
Mackers, when you say clear nail varnish, do you mean on top of the bumper black to seal them, or just straight on to the (cleaned) milky surface?