Which grease for plastic gears?

There's a red one that's ok on plastic. Just buy some.

CPC do 50g tubes of a viscous silicone grease.

I once took a motorised wing mirror apart to find plastic worm gears smothered in what I'm sure was silicone grease.

I bet that wasn't a mk4 mondeo. Sigh.

Thanks all, I got the silicone grease.

The main thing in plastic gears is to clean off all the old now very sticky stuff that has that over time. After that I have found tat a tiny amount of what we used to call sewing machine oil works a treat. Keep it away from belts though, as the most annoying thing is that these slip and won't let the discs out. I have also encountered unrepairable loading mechanisms where teeth are actually missing from a gear wheel due to the limit switches not working or being in the wrong alignment, Are you listening Goodman's, so in my view its the removal of the old grease and reassembling that is often the most difficult part, if you use thin oil it seldom causes an issue. Brian

Yes. The kind of whitish KY gel lookalike is a must have for D-I-Y - all plasics that need lube will do well on it

sewing machine oil has destroyed many plastic geared machines. Some plastics swell over time & fail.