Hi Siobhan as the others mentioned above ,Wonder wheels is a great one to use for getting rid of tar and brake dust and then wash of with soapy if you don't get it of the first time try it again but don't let the wonder wheels dry of on the alloys and if and i am not saying you have any cuts on your hands
try not to get the stuff in the cuts,it can sting abit,and then put a coat of wax if you like on the wheels ,not your hands
,something like snap seal or any wax that won't take you to long to coat the alloys and trafagalger rubber dressing on the tyres,i hope this helps,bye for now regards jon