On 30/09/2019 15:10, Michael Chare wrote:
The wiper blade arm on my car is very hard to remove from the motor
spindle, possibly because that part of the arm is aluminium and the
spindle is steel.Â* Would greasing the spindle be wise and would it make
much difference waht grease I used?


Use copperease/copaslip. You can also buy a puller tool to remove them,
but if you copper-grease them before refitting you'll not need it next time.

https://www.amazon.co.uk/dp/B01L38BE0M/