I normally use my bearing as they come out of the packet but after a wet or a very dusty day I tend to blast them with motor cleaner or WD40 to get the moisture or rubbish out and then I use Trinity Royal Oil to lubricate. The only trouble is it's a bit like rocking horse poo and difficult to get hold of but the container of it you get lasts for ages.
When mine runs out and if I can't get any more I'll probably use some sewing machine oil as I believe it's fairly similar stuff.
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