Buell recommends using Harley Softcloths with the following products to clean your windscreen. To minimize swirl marks, cleaning should be done when motorcycle is cool and parked in the shade.

HARLEY-DAVIDSON BUG REMOVER (Part No. 94657-98).
HARLEY-DAVIDSON SUNWASH (Part No. 94659-98).
NOVUS 1 CLEANER/PROTECTANT (Part No. 99837-94T).
NOVUS 2 SCRATCH REMOVER (Part No. 99836-94T).
HARLEY GLAZE (Part No. 99701-84) to polish and seal after cleaning.