i use white spirit with a plastic scourer (like you'd use in the sink for the washing up - not the metal brillo kind unless you really have too) - it's great for rust rash and road tar spots too - and any oil . it will often loosen uo the greae and move it around - wait for it to dry and then a clean cloth will just wipe it away.
while we're here - any alluminum oxide you may find - on hubs, or wherever - needs amonia for best results
i use white spirit with a plastic scourer (like you'd use in the sink for the washing up - not the metal brillo kind unless you really have too) - it's great for rust rash and road tar spots too - and any oil . it will often loosen uo the greae and move it around - wait for it to dry and then a clean cloth will just wipe it away.
while we're here - any alluminum oxide you may find - on hubs, or wherever - needs amonia for best results