Sorry - put another thing on Whites here this am. Should have combined it.
1. No spray is effective unless you actually hit the beasts. That mostly means turning every leaf upside down & spraying. So, if you've got that far, & have gloves on, just brush them off.
I've just done 4 rows this am. No gloves!!
2. Yes - but fleece is much less permeable than mesh. It takes a lot of rain to get through in useful quantity.
3. It's either brush or cover - there's probably enough moisture in the soil to see you through?