since you're using a beach towel for drying i'm going to guess you don't have great stuff for washing either. You might want to get some a nice microfiber wash mitt, two buckets for washing (look up two bucket method) some grit guards, car wash soap of your choice. Also get a nice waffle weave towel for drying, very absorbent and safe.
Clay bar (I use mother's)
Paint polish - i'm using einszett polish wax
Wax - P21s, its a great canuba wax.