When I had my santa's I used to do this procedure..
1. Rinse off and loose dirt with the hose pipe.
2. Use a clean sponge and warm water only.
3. Rinse down again and then check for any bits that I missed, If so use the sponge again.
4. When cleaning the next alloy I rinsed the sponge throughly just to
make sure that there was no dirt that could scratch the alloy.
5. Repeat 1,2,3,4 untill all alloys are clean, I used to use a turtle
wax blade to take the excess water off the face of the alloy, then I's
use a autoglym chamois to dry the alloys.
6. Id wax them every 2-3 weeks with quick wax detailer made by turtlewax and mine looked mint all the time.
p.s if anyones after a set of 5 santas pm me.
Sonny