Well quite a few people subscribe to using Windex, ( the old formula, not the new smell pretty ones) I believe windex would work.
also a thin mix of Dish-soap and water rinsed very well after works
I would not use alchohol on a dope surface personally,,, I would consider a wax and grease remover as used by auto paint shops,,
Whatever you use the objective is to float the contaminants off the surface and then wipe them off an edge while they are suspended in the fluid.
repeat several times