One reason that the pins rust so badly within the bush is that, following a suggestion in a well-known monthly comic about 30 years ago, people at one time were using washing up liquid to lubricate the bushes to aid fitting. Done it myself, which I came to regret. Apparently the leading brand, the long lasting one, which in all fairness does clean the dishes very well, maybe all others too, contains a large proportion of salt. We know what that does to steel!
Likewise don't use automotive products to clean the dishes!
I used to have a rattle can of rubber lubricant from Halfords, which works, as does silicone grease in spray or normal form. But I would advise the non-silicone rubber lubricant. Silicones tend to get everywhere and you may have to repaint part of the car eventually. Silicones, although harmless to the car, really mess up a paint job. Best not allowed in the garage, although I generally do use silicone brake fluid, carefully.
If all else fails, plain old-fashioned, non-detergent soap does the job fairly well. Don't use DOT4 brake fluid or even red rubber grease, as they will strip paint on the subframe.