Secondary issue is that in order to get at them well, the plastic scuttle needs to be removed.
Yes, you need to remove the wipers & scuttle to have any hope of undoing the nuts. If you're just greasing and fitting the covers, this can be done with the scuttle in place.
You need to remove the wipers before removing the scuttle (this should be obvious). To remove the wiper covers, put your fingers behind them and pull straight out towards you - don't let them twist or you'll break the fitting clip. The wiper nuts will then be easily accessible.
The scuttle is held in place by some rather nasty black plastic screws & plugs which are good only for one-time use. If you do try to reuse them, the scuttle will be loose & will rattle . I don't know if you can buy the screws & plugs separately, but you'd do better in any case to just replace them with suitable small screws, nuts & washers - I did mine with some black plastic coated ones I happened to have lying around.
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