I am currently treating my new mare for queensland itch. It has been hard as im sure the large stagnant lake close to her yard is the culprit and I can't move her because of the flu standstill
It has still been a bit cool here of an afternoon (brisbane) so I had to find a way to get around it. Im not sure what you are using but im having huge success with Quit-Itch and adding Equilibrium to her feed. This is a compound that doesnt need to be washed off. On the bottle it says to wash with a diluted amount of it and then wash off and add concentrate to the affected areas and leave it. I did this for the first few days until the vet told me to mix the diluted amount up in a larger quantity and add it to a spray bottle. This way I can quickly and lightly add whatever amount I need as many as two times a day and it doesnt have to be rinsed off. It dried very quickly as it is sprayed on and I can usually put her rugs on about 10-15 minutes after putting the Quit-Itch on.
Don't know if this is any help at all :)
This product also has a fly repellant in it so that it keeps any more bugs away while treating. After she is completely healed I will have to use a fly repellant on her during summer etc but hopefully the horse flu will be over by then and I can move her to a dry property.