Two main precautions.
Wool is a staple fiber. Don't over agitate it. This is more likely to be a concern when using brushes, bonnets, pads and similar methods.
Wool should be left in a neutral or slightly acid state. That is more important than the pH of the prespray. Some buffered prespray will maintain the pH even when diluted with rinse water. Other products don't have so much alkalinity and can be dropped to neutral easily. Check the pH after cleaning if you have any doubts about the products you use on wool. (pH and alkalinity are different.)
Scott Warrington